I believe that particular road is a borderline case. It might allow two cars to pass if they drive slowly and cautiously, but if a car and a small truck were to attempt that, one would have to come to a complete stop. In this case, your suggested tagging seems fine. Easier perhaps and less controversial would be to simply eliminate the lanes tag entirely and toss in an estimated width. Easier still: tag it with lanes=1 and let it go at that. The latter was my choice in this case because I wasn't aware of the more modern tagging scenario.

Thailand is very different from most other places because it has a large percentage of narrow streets that defy the usual logic for determining lanes. This makes for difficult tagging decisions on OSM. Check out this photo I used for my blog a number of years ago: 
How would you tag this one?
https://www.dropbox.com/scl/fi/7a6noujdbe3rf19f7210q/Two-lane-road-Thai-style-IMG_2459.jpg?rlkey=daat2m5nxj5uisyumfoktwtzd&dl=0
I'm not doing nearly as much mapping as I did a few years back and I don't subscribe to any mailing lists, so thanks for the update and the information. I will add those tags to my presets and use them when appropriate. 