Our universe does seem to have infinitely many observers in it but that doesn't necessarily mean it has to have a particularly high density of them. It instead indicates that particularly densely populated universes are unlikely for some other reason (e.g. uFAI or other planet-wide or lightcone-wide existential risks). Alternatively, it could be that for some reason the computation 'Earth around roughly 2010' includes a disproportionately large amount of the measure of agents in the timtyler reference class. Perhaps we third millennium human beings are a particularly fun bunch to simulate and stimulate.