If you have a DK subscription, go back and look at Lolley's and DKs articles from the past month or so. They mention he's been spotted working out at the facility.
In any event, there's also an article on that site from Lolley on March 1 where he quotes Colbert as saying that Tuitt definitely wants to play in 2022 and wanted to play in 2021.
Again, if Colbert/the team knows they have that commitment from Tuitt, I don't see them putting a deadline of OTAs on his return. Maybe, mini-camp. Maybe. And, if he's been at the facility working out, they have every reason to believe that commitment is real.
We'll see.