@carlos269 I don't see how any of our interaction has been bad for me. You might think so but we are all entitled to our opinions.
Your description about mastering isn't entirely accurate. For example if a producer is savvy and wants the best version of the LP release, he will send the LP mastering engineer a digital file that has no DSP except for perhaps normalization. OTOH if the mastering engineer is savvy he might request that from the producers so he can turn out a better product.
I've had both happen; anytime we mastered an LP we requested the least amount of DSP to get the best sound possible.
(My LP mastering system was a Scully lathe with Westerex 3D cutter head, driven by modified Westerex 1700 series mastering electronics. I had to rebuild the lathe and refurbish the electronics; I had to get in pretty deep.)
So the commercial release may or may not be that which you see on streaming services, and if it is from the actual commercial release it may not be the same as that which was used for the creation of the LP. That depends a lot on where they got the source file. Sometimes you see high resolution files that are actually just 16 bit but reprocessed to look like something more. Its a bit of the Wild West although it has been settling down in recent years.
The LP can be different in that there may be less or no EQ and less limiting and compression, because there is no expectation the end result will be played in a car. IOW that might be the best sounding version, but usually isn't something you can stream.
Now what you do with the file when you get home is up to you. There are plenty of people that miss the tone controls that were everywhere decades ago. So regarding your question about HQPLAYER, my answer is, using the text of your question, you're not improving the source material but you may be liking what you did to it. There is a distinction but its unimportant since the end goal is to enjoy the hobby in whatever way you see fit.