Stalemate in 16 moves?????

Here's a link listing a chess variant using the 15-16 move draw
http://www.chessvariants.com/oriental.dir/burmese.html
😀
Certain endgame rules, similar to the 50-moves rule, but perhaps even more similar to the endgame rules of Thai Chess (Makruk), are used. Pritchard does not give a full list, but mentions that when one has a rook and king against a lone king, then one must give mates within 16 moves - if not, then the player with a lone king can claim a draw. However, when the lone king is on one of the four squares in the center (d4, d5, e4, e5), then the 16 moves start to be counted after the 5th move of the lone king (effectively giving 21 moves).

I remember a player tried to claim stalemate but claimed stalemate mean't you didn't have any moves that would prevent you from being checkmated this rule was obviously fabricated.