How is that at all the same thing? Lying to the world about what happened with Ace is one thing because WB has lied to the word to protect their image of how he wants his crew to be seen, just like when he took out his medicinal tubes so he wouldn't look weak and the world wouldn't know he was sick.
Because deep down he cares. It's the same reason why WB lies about sending Ace after BB, Ace felt like he ****ed up and despite Ace knowing he ****ed up WB hides that from everyone. You could see even see WB himself starts sweating a bit after the stab, but yeah it didn't affect him in the least right?
Lying to Squard wouldn't be the same because Squard still knows he ****ed up. He wasn't even lying for the sake of Ace's emotions, so it's doubly nonsense to say that proves he'd lie to Squard.