I think anyone who thinks that science provides some sort of "absolute truth" is either unsure of what science can do or is intent on denigrating it. I don't know how to do science but I'm pretty sure I know that "absolute truth" isn't something a scientist would claim.
I would imagine that science, like any other human endeavour, is subject to the vagaries of human behaviour. There will be frauds, cheats, plagiarists, liars, charlartans and other undesirables in science just like there are in every other field of human concern. But the individuals who fail to live up to the rules don't invalidate the process that the rules are intended to support and protect.
Science is a field of study but limited by human understanding and of course impacted by human nature. I do not know any scientists that claim to have a source of absolute truth but I believe that many non-scientific minds believe that theory is absolute truth.
The public has been led to believe that evolution is an absolute fact and not just another theory.