Correct
The "tax clearance" issue for travel has been around for many years but in the last few weeks they have revived it.
Not sure about Thailand but in Malaysia the tradition is that things like tax, speeding fines etc are not paid until the authority offers a discount month.
As an aside Malaysia has just started to track Singaporean vehicles with outstanding traffic fines. It seems that those law abiding Singaporeans aren't as squeaky clean when it comes to paying Malaysian fines