That's odd. Double check that you replaced the .exe's in your TDU directory (especially TestDriveUnlimited.exe since that's the one Project Paradise will launch anyways), otherwise it might be a PC spec issue. Just tested it by taking the R32 from the south coast to Beat the Clock, and then did the event (~45 mins of long-distance driving total). I didn't experience the same issue, unless it happens after an even longer period of time.
I did have an issue with the AE86 before 1.04 where it would randomly tank the fps after entering certain dealers, and even could make it crash by viewing the S30 from Japanese Classics if I entered it with the AE86, but haven't had these issues since the 4gb patched .exes were included.
FR is a relatively big channel, I wonder if Alex is gonna bring in some new players. TDU Platinum really does deserve the attention, it's kinda shaping up to be the ElDewrito of the TDU community. Maybe it could get more people streaming it. I wish RacerX would stream it again, that stream was a lot of fun.
Also confirmed that the Esprit can be purchased.
Side note to some of the videos on Platinum, kinda a shame that some of them have the music turned off. I get that Alex is talking throughout the video so it makes it easier to just turn it off, but there's so much nostalgia from the Porsche Unleashed tracks in particular.