Apple Music includes iTunes Match, therefore,Yet it went over your head. It’s included but only if Apple Music has it. Anything unique and not in Apple Music that u upload you need iTunes Match.
"iTunes Match scans your iTunes library to catalog the songs in it. Apple's software then adds music you have on your hard drive library that's also available on iTunes to your account. It doesn't matter where that music came from—if you bought it from Amazon, ripped it from CD, or acquired it from another source. As long as it's in your library and available in the iTunes Store, it'll be part of your iCloud Music Library.
Apple uploads music in your iTunes library that isn't available in the iTunes Store from your computer to your iCloud Music Library. But it only does this with files in the AAC and MP3 formats."