incorrect. Every time you do a 90 day report if you have been away from your home even for a day and staid somewhere else you will need to do a new tm30 registration.
Sounds like a suspect claim here - they are obviously investigating everything very carefully. A lot of scams going on at the moment. Especially those businesses which are for sale - and suffering mysterious fires!
Bangkok Bank provide foreigners with what they call a savings account which you can take money out whenever you want - but for immigration purposes the important thing is that the account should be in the applicants name only.