I don’t trust anything said by a seller about subjective aspects of their audio equipment; they have motive to stretch the truth, and no reason to be especially truthful because there are no consequences.
I do have a measure of trust in the forums and reviews, but not in any single forum comment or single review.
The more sources the better, but if I read the same thing repeatedly stated the same way - ie, ’It’s a ’musical’ amp' - I ignore it.
If the descriptions are made by persons with experience of the equipment, and in their own words those various persons are found to be saying essentially the same thing, then I have found that it is true.