The mentioned alibabacloud article links to a CNCF blog post with regards to optimizations of the idle page management algorithm of etcd. The CNCF blog post mentions a pull request for the changes. That pull request has been merged in the mean time. So, yes, I assume that the improvements have been merged into etcd (bolt to be more precise).
The etcd dev guide states:
8GB is a suggested maximum size for normal environments
I would emphasise suggested
and normal environments
. I haven't found any resources on actual limits. So in my reading the suggested maximum size doesn't necessary mean that those improvements haven't been implemented. I assume it is recommend because it is enough for the average use case.