No, he's lost voters, but those lost voters are largely swing voters, I'd argue.
He's beginning to look like he's solidified most of his hardcore GOP vote. Even if you don't look at the numbers, look at what other GOP officials do - most of them bent the knee to him yet again after his second indictment outside of like, Romney and Christie. They know that they can't attack Trump without self-immolating with the GOP base.
Imagine if Biden got indicted for stealing classified documents and had them out next to his Corvette in the garage. Anyone primarying him would be roasting him, and I'm not just talking the kooks like Marianne Williamson or RFK Jr.