How often do you see starters transfer from a Power 5 conference? Almost never. I am certain this tweet isn't about him transferring.
A few impact transfers that started for other teams come to mind.
Marcus Foster, Creighton - started at KSU
Nigel Williams-Gross, Gonzaga - started at Washington
Jordan Mathews, Gonzaga - started at California
Katin Reinhard, Marquette - started at USC
Andrew White, Syracuse - started at Nebraska
There have been a number of others I can think of like Austin Nichols, Cullen Neal and Terry Larrier that weren't at P5 schools but the schools they were at are solid basketball programs (Memphis, VCU and New Mexico).