Do I need to report to immigration every 90 days with a DTV visa in Thailand?

You have to report every 90 days but ONLY if you stay up to 90 days CONTINUOUSLY in the Kingdom. For example I've been here for 14-15 months already, but needed to do the 90-day report only once so far. Every time you cross the border out of Thailand, that 90-day clock resets, no matter if you stay outside for one hour, one day or one month.

As well as 90 days, you also have to ensure you or your landlord report within 24 hours of returning to your usual address if you've been travelling

You have to report every 90 days. At 180 days you either have to exit the country or apply for an extension, but the extension is hard to get