This is why I hate video theories, this is flat-out horrible, but the creator wants to make it look appear sensible with smokescreen and flashy effects figuratively speaking. I'm starting to hate the "Oda is a god of foreshadowing" statement even more than I already did due to people and vids like these. Yes Oda foreshadows stuff, but what he doesn't do however is foreshadowing every little minuscule non-important thing =/
Cobi saying that pirates have invaded the marines as spies is not a foreshadowing.
Usopp having written on his swimming trunks "lie turns into reality" is not a foreshadowing.
Concept arts are no foreshadowings.
Oda saying he is eating a popular Japanese meal in Japan is not a foreshadowing.
Crocus drinking with an unknown character is not a real foreshadowing.
The SBS thing is only half and half a potential foreshadowing.
A good and a real foreshadowing will only be clear when the thing it foreshadows has occurred and has a unique property that makes it almost certain it was meant as a foreshadowing. Especially the latter thing is important as something that's vague and ambiguous would be extremely redundant as a foreshadowing because even if what it foreshadows has occurred, you can't say for certain it was a foreshadowing.
Cobi making a general, broad remark of how pirates have been known to infiltrate the marines as spies and it actually happening 700 chapters and 15 years later, is not a foreshadowing because that statement is so incredibly vague and general.
Usopp having that sentence written on his trunks is representation of a personality trait of his, not a foreshadowing. That some of Usopp's lies became truths has been discussed for years now as it was already proven all the way back on Little Garden it was possible. So having that written on his trunks in a recent cover art is not even remotely a foreshadowing.
Concept arts by their very core mean that they were things that did not made the cut or got changed that much it really isn't a foreshadowing anymore. For example I can see traits of Dorry, Don Krieg, Z and Pica among others in those concept characters. The fact that these concepts were released alone means that even if something still would be used from them, it would be so different it's not a foreshadowing anymore as they really aren't going to release exact concepts of characters that have yet to appear unless it's specifically stated like they do for movies and games. Even if one of those concepts still would be used, he would be so different that any kind of intentional foreshadowing would be mute.
I mean Oda saying he is eating udon, a popular and common Japanese food, and afterwards introduces a character named Oden, now as as a foreshadowing that would be so utterly stupid it can't be a real foreshadowing. I mean how does that sound? "I'm eating udon" "Omg Oda is saying a character that is named Oden will be introduced"! It makes no sense, the two have nothing in common and apparently Oda then can't say anything even boringly normal without someone finding a meaning behind it. It's possible there was some inside joke for himself, but you really shouldn't become paranoid about this.
That Crocus is drinking with a character that has its back to us, well then there is logically a high chance that character will pop up sooner or later. That however can not be considered a real foreshadowing simply because that possibility would be that obvious. It's similar to how we can be certain the last unknown admiral will make his appearance at some point.
The only thing that could be considered half and half a legit foreshadowing in that entire vid, was the SBS part. Though technically speaking that person only asked one question and Oda replied to that one question. He didn't ask anything about those rabbits, he just mentioned it. Now that Oda ignored the rabbit-thing might indicate it indeed has some kind of importance.