This isn't an overly apples-to-apples comparison. It factors in costs like "updating your kitchen", making things more stylish, etc.
The author also seems to assume you'll be paying more to heat and cool your house because if you're renting you're in an apartment? Just down the road from him, four of the five homes I rented before buying in 2021 are larger than the home we bought.
"Less than 21% of my monthly payment is going towards paying off the loan" - well, yes, because it is front-loaded with interest. And as you get through the loan, 80%+ will be paying off the loan.
Maybe different loans are different, but generally your home insurance and property taxes are rolled into the mortgage (and often paid on your behalf by the servicer) - indeed, it seems like there's a double dipping of breaking down his mortgage payment and the component that is tax and then saying below "I currently pay $515 in taxes monthly".
There absolutely are additional costs to owning a home, to be very clear.
But there's definitely a contingent (and this post isn't the "worst" of them) that likes to paint home ownership as nothing more than opening your check or pulling out a credit card every month for "the next four digit expense".
Especially in Western Washington where the property market 2010-2020 was "a good one". (I put down 10% and at the contractual "year-and-one-day" on my loan for the soonest I could remove PMI I was able to because I'd hit 20% equity on value increase - only making my regular payment), something that he benefits from, too:
> I bought my current home in 2011 for $420k, and the Zillow currently estimates its value at $757k. I've put a lot of money into it catching up on maintenance, repairs, and improvements, but the appreciation will definitely exceed whatever I've put into it when I decide to sell it.