I didn't "hear" it, I "reasoned" it.
Games that sport such complex modeling (character AND environmental) with a consistent framerate as shown in Resi4 simply haven't come in the 60fps flavor in this generation.
I also own P.N.03, Shinji Mikami's "other" game besides RE:Remake, and also looks like it's based on the Remake modeling engine, and what could be a premature/primitive version of Resi4's 3D engine. Vanessa's character model is *nicely* detailed, and the walls/floors/rooms are given a generous amount of polygons to give them the round/smooth look. Lighting is also good. But, the game came out sooner than the other "Production Studio 4" games, had horrid enrivonment texturing, color palette, and no deflicker support (hence why i deem it "premature" -- a rush job?), but in the end ran at a rock solid 30fps.
Looking at the TGS2003 Resi4 trailer from Capcom of Japan's site, Leon's movements in the "non-blurry" portions of the film are consistent with the way characters moved in video I've captured from the Remake and Resi0, which are both running at 30fps. Additionally, since Resi4's characters look comparable to those in the Remake, and the environments look more complex than those in Silent Hill 3 (also 30fps), "something's gotta give."