I had tremendous difficulty navigating to read this. For whatever reason I could only visit page 1 and 10, so I wasn’t able to form any assessment of the article you posted.

So it is without that background or knowing exactly where you stand that I offer:

The lack of a commonly understood mechanism that can be used to communicate about pain with a lobster doesn’t mean that lobsters are incapable of feeling pain any more than it means that humans are incapable of feeling pain because we can’t talk to lobsters about it.

This applies to any other creature.

The lack of a common language doesn’t hold water as an argument that experiences can’t be shared.

It may be that you and I agree with this, or not, but it is difficult without having read the article.

Do you have a more accessible link by any chance?