The interlocutor shminux is describing rejects the idea that experimental results can be definitive on this question, which is different from the position you describe here.

That depends on what you mean by "experiment". If you mean doing a proper replicable controlled experiment than there is no experimental evidence. If you mean any evidence based on observation than there is experimental evidence.

In other words, there is evidence for the intruder, just not scientific evidence in the sense of this post.