The post in question makes no mention of FOSS exclusively resulting in better software than FOSS + non-FOSS. Are you just debating Stallman's generic platform here? Seems a bit off-topic to me...
Which is perfectly in line with pretty much all of his life and advocacy: for RMS, user potential freedom (to much around with the internals of his device, software and hardware) trumps everything.
Therefore, as somebody making locked-down everything and locked-down everything cool Jobs was a nemesis figure. It makes perfect sense for Stallman to be glad he retired from current affairs, that Jobs had to retire due to death does not really enter in his thinking because as far as he's concerned it's a completely separate issue.
Those demonizing him for his comments are just idiots.