Apple Help opening in Spanish

Are you sure the URL you provided earlier is the one you are using? To me it shows

https://checkcoverage.apple.com/country-region?locale=en_US

There are other language versions. The pages render by default to your country setting language, unless overridden by modifying the URL.

It would help to see that article. The place it takes you to is not a support article as such, but with support articles if a person omits the country coding (see the end of the text line in my previous post) then the language defaults to the language to which the person's account is set. I do that when I reply because even I reply in English, they will get the support article version in their language. Not many do it here though, and they may copy links for their country which may not be appropriate on this worldwide forum. A few articles may even have small variations between regions.

Conversely, if I include a forced language encoding, I can make it appear in another language. You see, this title appears in English but I included coding to open in the French version.

Here's a non-country specific link that should work for you.

Is your account set to a country where Spanish is spoken? If yes, then that's your answer. You may be able to change the country/language version in the bottom right of an Apple web page but I don't know if that will get you a different version of some fundamental pages where you may need to log in to get information. In that case you might just need to use the language version you are offered.