Sure, we probably can't know for sure who has the biggest as they try to keep that under wraps for competition purposes, but it's definitely not "wildly untrue." A simple search will show that they have if not the biggest, damn near one of the biggest. Just a quick sample:
https://nvidianews.nvidia.com/news/spectrum-x-ethernet-netwo...
https://www.yahoo.com/tech/worlds-fastest-supercomputer-plea...
https://www.tomshardware.com/pc-components/gpus/elon-musk-to...
https://www.capacitymedia.com/article/musks-xais-colossus-cl...