Google shouldn't do that comparison. When I worked there I strongly emphasized to the TPU leadership to not compare their systems to supercomputers- not only were the comparisons misleading, Google absolutely does not want supercomputer users to switch to TPUs. SC users are demanding and require huge support.
Google needs to sell to Enterprise Customers. It's a Google Cloud Event.
Of course they have incentives to hype because once long-term contracts are signed you lose that customer forever. So, hype is a necessity