Luckystar5:H2H matches do not count toward your average. But you can be promoted all the way up to and including master tier.
This is true, and the following information that you give partly is and - excuse me - partly isn't.
No "win loss ratio" is invoved AFAIK.
On all devices, ranked strokeplay rounds on most courses move the average (except for Par3s, Par5s, CC Custom Courses) and lead to tier moves, demanding certain score numbers and average thresholds as a prerequisite.
Also, rated match play wins against higher tiers and credit wins in tournaments may contribute to promotion until Legend ("anti sandbagging rules").
Practice play as well as CTTH, Blitz and Alternate Shot games (A/S) do not contribute to average and tier.
Average resets on the first ranked round after promotion. Therefore, higher tiers with higher average numbers are a common sight, while they are struggling with the new, harder conditions, longer tracks and/or higher green speeds.
On mobiles, all the "mobile" matches played, H2H, "coin rooms", are considered practice play, not counting to the average. Thus those 150 averages. Here, tier advancement, until Master, is apparently coupled to XP or level rise. Afterwards, the common rules above apply exclusively.
Hope I could help!