Not true. Under Thaksin, visas became increasingly more difficult to obtain.
During Thaksin's time in office, they stopped the agents sending your passport out of the country for visas and stamps, raised the departure tax from 500 to 700thb, raised the extension fees from 500thb to 1,900thb and raised the overstay fee from 200thb per day to 500thb.
There were other initiatives that began in his first term of office as well, those are the ones I can distinctly remember.