I have a feeling I was supposed to enable the debugging log after seeing that option, so I tried it again after doing that. This is probably more what you were looking for:
2019-07-07: SM-G950U; 9; 1.0.1
11:22:48: loadStats: /storage/emulated/0/gmmp/stats.xmlexists
11:22:48: loadStats: before start observer
11:22:48: loadStats: after start observer
11:22:58: loadStats: return null
11:22:58: sendStats: Unable to retrieve stats for player: 1
11:22:58: loadStats: event=32768
11:31:19: startSync: preview=true,iteration=0
11:31:19: command: action=SYNC_START
11:31:19: tryStart: connecting /192.168.1.2, attempt=0
11:31:19: tryStart: connected
11:31:19: tryStart: hello=true,fromMB=true,custfiles=false,preview=true,dev=SM-G950U,2
11:31:19: storage: path=/storage/0000-0000,root=0000-0000:,uri=content://com.android.externalstorage.documents/tree/0000-0000%3A
11:31:19: syncDevice: root=/storage/0000-0000,ignoreErrors=false,playlists=false,ratings=true,playcount=false
11:31:20: syncDevice: command=SendStats
11:31:20: loadStats: /storage/emulated/0/gmmp/stats.xmlexists
11:31:20: loadStats: before start observer
11:31:20: loadStats: after start observer
11:31:30: loadStats: return null
11:31:30: loadStats: event=32768
11:31:30: sendStats: Unable to retrieve stats for player: 1
11:31:31: syncDevice: command=GetFiles
11:31:31: getFiles: Get: Music/,url=/storage/0000-0000/Music/, inc=true
11:31:32: getFiles: count=14962
11:31:32: syncDevice: command=GetFiles
11:31:32: getFiles: Get: Music/Podcasts/,url=/storage/0000-0000/Music/Podcasts/, inc=true
11:31:32: getFiles: count=0
11:31:32: syncDevice: command=GetFiles
11:31:32: getFiles: Get: Playlists/,url=/storage/0000-0000/Playlists/, inc=false
11:31:32: getFiles: count=0
11:31:33: syncDevice: command=ShowPreviewResults
11:31:33: syncDevice: exit
A smile is happiness you'll find right under your nose.