I travelled to Malaysia once last year and twice to Cambodia/Aranyaprathet. During my 3rd trip crossing, I was inform about the limits (2 times) of land border crossing at Thai custom even though I am from Singapore. Even the officers at CW also said it’s only x2 per calendar year for Singaporeans. So where your info came from?
Land border crossing is up to 2 times per calendar year. Doesn’t matter if you came from Malaysia or Cambodia or any other neighbouring countries of Thailand