You are right on RDS but I believe the problem is on Aurora PostgreSQL where the pglogical throws an error during installation. Are you aware if this works on Aurora PostGreSQL
It seems like this question should be sent to AWS support for Aurora if you are wanting to upgrade an Aurora 9.6 instance to 10x also in Aurora.
Yes you are right on that I dont believe in AWS support group but rather I feel this community has more experience and have more knowledgeable folks. I reached out to AWS support and got a reply as 'NO' ( This is not supported from Aurora PostgreSQL)