I wouldn’t trust the thoughts of anyone who can come up with or believe such an argument. It’s so obviously fallacious,
Obviously you have to start with the assumption that your thoughts can be trusted (basically - you still need to guard against error). And if you don’t you certainly can’t assume your way out of the problem.
Once you admit that assumption you can try and work out where thoughts come from. Avoiding obvious fallacies of composition which require the basis of thought to be purely mental.