I dunno, this take is a bit weird to me. The work we did to support Graviton wasn't "moving" from Intel to ARM, it was making our build pipeline arch-agnostic. If Intel one day works out cheaper again we'll use it again with basically zero friction.
I bet quite a lot of migrations involved changing hardcoded instance types, docker image shas etc. Would be hard to revert back to quickly.
I think the take is pretty good one.