> While we were already in progress of migrating out of our smaller custom data centers into public cloud, we started working on path to multi cloud. This longer-term measure is necessary to achieve the level of resilience, low latency, and flexibility that will be needed in the future.

That paragraph read, to me at least, that the initial targeted changes were just the tip of the iceberg and that much heavier lifting than initially budgeted were now in scope.

"smaller custom data centers into public cloud" is talking about their Azure migration, so "multi cloud" would almost certainly mean extending a presence into AWS and/or GCP (or maybe others like OCI).

I'm sorry but I really don't see how you're drawing conclusions about this meaning a move off of Ruby and MySQL entirely. That's a huuuge logical leap away from what is written in this post, and you originally stated it in a way that indicated this was a fact.