I'm old enough to have owned a number of homes in a number of jurisdictions, so I'd caution that these numbers will differ significantly depending on where you live. For example, insurance is hugely influenced by fire risk, so a rural or semi-rural home can easily cost 4-5x as much to insure (and some insurers will give you "please go away" quotes, so it's important to shop around).

Similarly, taxes will depend on the locality, loan costs depend on the lender and the loan amount. Utility costs in SFBA can be easily 4-5x higher than elsewhere in the US, etc. So your totals could be easily 30% or 300% of what's outlined in the article.

The one important point that the article makes is that your ongoing costs will also vary dramatically depending on how much work you're willing to do yourself, especially in high-regulation, high-labor-cost areas such as SFBA. A basic job, such as replacing a leaky flush valve, can be hundreds of dollars in plumber costs, or $19.95 if you go to Home Depot. Hiring a painting contractor can cost thousands. Etc, etc.

I've also seen several homeowners outright taken advantage of. My main example in the US are various "mold remediation" contractors, who can help you in some really bad situations, but they're just as happy to charge you $20,000 to do nothing of value based on vague fears.