In saying this, he declared all foods clean

[Rob]

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.

Some people refer to this type of language regarding the Torah as a superlative comparison. Meaning that the actual language may be against the torah, but the point is not. The language is harsh in order to straighten out priorities and express the point.

Matthew 23:23
"Woe to you, teachers of the law and Pharisees, you hypocrites! You give a tenth of your spices???mint, dill and cummin. But you have neglected the more important matters of the law???justice, mercy and faithfulness. You should have practiced the latter, without neglecting the former.