However, as a non-native English speaker, it might not be accurate. Feel free to modify it.
I'm also not good at wording, but I have a minor suggestions like the following :
/* * Also, the FETCH FIRST/NEXT ... ROW/ROWS WITH TIES clause cannot be pushed down * because: * a) The remote system may have a different understanding of equality, which can * result in varying results, such as non-deterministic collations. * b) We do not have knowledge of the remote server's version * as this clause is only supported for PG13 and above. */