Here is a better guide that will also explain the logic of it. https://www.rtings.com/tv/reviews/by-size/size-to-distance-relationship More on reddit.com

The formula for calculating the perfect screen size is the intersection of what you can afford and what your wife will allow. More on reddit.com

Yes, it's true, at least from a strictly resolution perspective. Despite what some people here think, most people don't have superhuman vision. That said, it doesn't really matter. Unless you're going the large projector route, there's little reason besides budget to not go bigger. Think of this as more a general guide for the smallest you should go for the distance (within reason and whatever constraints you're working with). A 4k TV is still worth it even at longer than optimal viewing distances, as UHD comes with a host of other benefits (particularly HDR) that contribute much more to overall picture quality than the resolution. Many people claiming they can tell the difference between 1080 and 4K at absurd distances are seeing the improvement in encoding quality, HDR, refresh rate, panel/processing tech improvements, etc, not the higher resolution. More on reddit.com

You're fine. You could probably do 75" for really good immersion, but if it's a living room, 65" will be perfect. More on reddit.com