It's extremely strange for RCDB to list stats that haven't been confirmed for an upcoming project. It's even more suspicious that these happen to perfectly match the NoLimits prediction video out there. I suppose the length can be estimated somewhat from site plans, but previous things I've heard regarding this project implied it would be under 100 ft. tall and not contain inversions (which I don't think the motorbike coasters are capable of, assuming similar restraints on this ride). Could the restraint system have been redesigned for this, or could that information be inaccurate? Absolutely, though I would have expected the pitch to be a bit different in last year's surveys if the thrill glider was intended to be an inversion-centric ride. Also...
Without giving any detailed specifics from the press kit I will say this...
If the stats I saw were correct, then this will be the second longest inverted coaster on the planet just behind Banshee.
If true, this would imply a length of between 4,048 ft. (Pyrenees) and 4,124 ft. (Banshee). If the length is indeed only 3,576 ft., that would make it shorter than not just those two, but also five additional B&M Inverts (Alpengeist, Katun, Monster, Montu, and Raptor), so they couldn't even claim it as the longest inverted coaster at a Six Flags park (though they could technically claim the west coast record despite it being slightly shorter than Tatsu).
I suppose we're not really going to know anything with certainty until the park makes an official announcement, which likely won't be until summer/fall. However, consider me quite skeptical of these numbers without corroborating sources.