Yes "Matched" or "Uploaded" is what you own* and everything in the "Kind" column called
ACC audio file
MPEG audio file
Purchased ACC audio file
Purchased MPEG-4 video file
etc.
Only if it's listed as Apple Music AAC audio file it's not your's.
By the way my iTunes Match subscription has expired months ago and even was on another Apple-ID. I think you also don't need it anymore if you have an Apple Music subscription if I don't miss anything. Seems to work like before.
*And always keep a backup of your purchased files or convert them to a standard AAC audio file. Just select the files and click on convert in the file menu.
Some of my purchased album's bonus tracks are not available anymore for download and in Apple Music.

The conversion format will always be what is set for importing CDs (standard is AAC 256).
Downside is, you have those albums twice in iTunes if you don't keep the converted files somewhere else. You shouldn't lose any quality for converted purchased files as long as they are matched.