Somebody obviously went native...
Last I checked, you needed three uninterrupted years on the same
visa to begin applying for
permanent residence. Also, you will be given a test of
Thai. For this, you should prepare for their
Thai sixth grade exam for foreigners.
You can circumvent all these rules legally if you enter
Thailand with 2M
Baht (about US$60K) in your pocket, or have a pension of about a thousand a month. Thais like foreign money. On those terms, they'll let you stay as long as you want.