First of all, there are two versions of Suspiria. The original is a 1977 Italian horror classic based in the nightmare-logic that Dario Argento is famous for. The sequel is a 2018 film is a complex and unnerving film about guilt and believing others (particularly women.) The latter is more story-driven with moments of body horror while the former is much akin to Psycho in that it might not scare you, but it’s a classic.
Second, most speculation that ends up sticking comes from those who have a track record of knowing people. Some stuff that gets mentioned at the beginning sticks initially, but then fades away once more information is divulged. See: KKFOS in Orlando. Everyone was saying how obvious it would be to have that be a house. It stuck around in speculation until about two or three weeks ago, which is when we found out that “Cotton” was an original, not an IP.