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Moving ports does help. It is not a sure thing but when used in conjunction with other security mechanism can help get rid the of the low hanging fruit of scriptkiddies and automated scans.
But scriptkiddies and automated scans are not a security threat. If they were a legitimate threat to your server, you have bigger problems.
All it does is reduce log chatter.
Anyone actually wanting in would port scan, then try and connect to each port, and quickly identify an SSH port
Imagine that the xz exploit actually made it into your server, so your sshd was vulnerable. Having it on another port does seem helpful then. In fact i sometimes think of putting mine on a random secret address in the middle of a /64 ipv6 range, but I haven't done that yet.
it occurs to me, the xz exploit and similar is a good reason not to run the latest software. It affected Debian Sid but not the stable releases. I'm glad I only run the stable ones.
Just have 2 ipv4 assigned to your server. Have 1 for all your services, and run ssh on the other allowing root login with the password "admin".
A random ipv6 in the same subnet as your server is just obscurity.
The XZ exploit would be functionally similar to allowing root login using the password "admin".
Would doing that on a different port be secure? No? Then a different port is not security, it's obscurity.
Obscurity is just going to trip you up at some point and reduce log chatter.
And yes, running LTSB/stable is a sensible choice for servers.