There are certainly talmidei chachomim who have done plenty of research who have come to the conclusion that it’s not techeiles.
If you are convinced that it is, fine, wear it, but have the humility to accept that there are those who are very much inside the subject, are much more knowledgeable in halachah than you are, and disagree with you.
Furthermore, to assume that R’ Chaim came to his conclusion out of naivete is degrading.
While you’re with R’ Chaim asking mechilah, why don’t you ask him why he rejects murex.