In saying this, he declared all foods clean

[Gentile]

The metaphor used by Christ is excellent when used against those caught up in rituals and failing to see the deeper things but in any case translations always gave this bit in brackets so I think it is unlikely that he said it.

It all depends anyway on your viewpoint - did Christ do away with the Torah or maintain it? This has been a hot issue for centuries. My take is that he confirm the Torah but wanted to end robotic rituals with no substance in them and try and get people to open their hearts more. Jeremiah and Isaiah also say similar things.