Your claim is especially questionable, and I'm a bit surprised The Matrix.org Foundation (npub1m9z…whzq) is boosting this so indiscriminately, they should know better:
EMS, without doubt the largest homeserver operator, does not operate customer matrix homeservers themselves on-prem; their infra runs on AWS, which, if you asked me, is as hyperscaler as they come; try
$> dig fosdem.ems.host
and get
fosdem.ems.host. 300 IN CNAME k8s-core-coreingr-e213c56b76-ef68a8798c5364b0.elb.eu-central-1.amazonaws.com