Prog bands change, people change... nothing wrong with that, feel comfortable posting whatever you feel right now. I wouldn't worry that anybody is gonna check posts 5 years old, many don't even pay attention to yesterday's posts.
As for reviews, indeed they can be edited, but even if you don't it's not that serious, they reflect what you thought of the album at the time of writing, if your opinion has changed it's no big deal. Until recently anybody who wrote and published something had no possibility to edit it, it was set in stone for posterity, and people still changed their mind, no big deal. Einstein published his equations with the cosmological constant, then a few years later he dismissed it as 'the greatest blunder of his life', and later it appeared that he had been correct all along after all.