It no longer suggests an element to remove in response to invalid RSS 2.0 (and perhaps other versions).
He also says this about the validator, which is an open-source project:
The RSS validator has always been neutral in the RSS wars. In particular, it provides valuable feedback on the quality of RSS 1.0 feeds as well as RSS 2.0. In fact, most of the code is common between the two.
If somebody were to wish to constructively contribute to this effort, particularly one with strong Python skills, he or she would be eagerly welcomed by me.