The "Display total price" toggle should just be deemed misleading all together. It's explicit that it includes fees and not taxes, but is withholding tax info really the total price? No.
I had assumed that it was a way to avoid paying the parent/franchising company, or paying commission on it to booking sites, which I think might be the case, especially the latter since they generally collect it on premises not through the booking engine.
...much further down the page in small font...
Total Price (tm) is our proprietary number we just make up because we actually hate you, our customer, and want to bamboozle you into spending far more than expected.