This can be easily explained as being the result of the tools being incorporated into Susano'o, not that the tools are able to interact on the physical plane because of Itachi's chakra.
If they are incorporated into his Susanoo and take on the same appearance as it, that means they are made of the same substance at that moment in time. Lmao you're doing all these mental gymnastics to avoid admitting that what you blatantly see in front of you is true.
If the tools had their own standalone form then they wouldn't need to take on any properties of Itachi's Susanoo. Susanoo adopting outside weapons causing said weapons to match it's every characteristic is a perfect example of conjecture.
This still doesn't mean that Itachi gave them a physical form with chakra. This also raises more holes; if the weapons don't exist on the physical plane without Itachi's chakra, how did Itachi find them?
On it's own obviously it doesn't so that's a useless critique. The bold is an irrelevant question because the answer to that question has nothing to do with what has been stated about their physical form.
Except it's not a fact that the tools can't operate on the physical plane without Itachi's chakra.
If they don't have a physical form they need something, regardless it being Itachi's chakra or not, to interact on the physical plane. Don't argue that objects without a physical form are physical on their own. That makes no sense. If they aren't physical, they cannot interact with physical objects on their own.
Except these concepts aren't mutually inclusive. Them being the same color as Itachi's Susano'o does not mean they are made out of the same material.
Come on now.
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When compared to other Susanoo and their weapons Yata and Totsuka appear no different, which is why I said they appear to be of the same material and match his personal chakra color.
So based on what I'm reading here, despite Yata and Totsuka looking like any normal Susanoo weapons (which are made of chakra) when in use by Itachi and also matching the color of his chakra to boot, they are actually not made of chakra when in use by Itachi. :lol