I hope this is not the case, because it would mean that I'm currently being charged twice for the same service.
It's a little annoying they don't remind folks that if you have Apple Music, you really don't need match any more.
The ability to listen to some of the music I have that's not available on streaming services is one huge reason I chose Apple Music over Spotify.
I still made a backup of everything before turning Match off :)
Now whether I could, say, rip a CD, match it and it would stay forever like it did with Match - that is an interesting question.
In contrast, handling that job correctly is the entire purpose of iTunes Match. Even if it is essentially abandonware within Apple, as long as it keeps working I will use it.