Fischer being 3000+? Bullshit.
Fischer being 2900+? Perhaps, but I highly doubt it.
Fischer's peak elo is rated about 2785... maybe close to 2800 at some point but surely not 2900+.
Can we agree that Bobby Fischer was a genius for his time. And the poster who said he could beat him easy last year I think would be the most amusing. I would be like me playing D.
Fischer didn't trust computers and couldn't use them in training. Anand relates that he analysed with Fischer and said he was quite strong, but he couldn't accept the computer's evaluations. Anand didn't say it explicitly, but he clearly inferred that Fischer was behind the times and couldn't adjust to modern training techniques.
All of this counterfactual "if Fischer had access to today's engines he'd be even stronger" stuff ignorés Fischer's very nature.
Fischer was right, in 1990 engines were bad (I assume Fischer and anand could work together around those years).