I went through in July this year, and to be honest I wasn't going to be in the country more than 10 days, so I can't confirm or refute the rumour. If I remember correctly the temporary vehicle import paperwork was made out using info from my visa. I believe a tourist visa is valid for up to a month, depending on what you specify when you apply for it. So presumably the old rules were that you'd have to get both visa *and* import certificate extended if you wanted to stay longer than the original visa.
Sorry I can't be more helpfull. Hopefully someone who's been over this autumn can straighten things out.