From the article. "This is not typically a problem, since most browsers don’t support URLs longer than 2048 characters, but the relevant RFCs support up to about 8 KB in most cases. (CloudFlare supports up to 32KB.)"

So obviously relying on browsers is not enough, but a nitpick. The article links to a stackoverflow which actually notes browsers support a lot more.

     Browser     Address bar   document.location or anchor tag
     ------------------------------------------
     Chrome          32779           >64k
     Android          8192           >64k
     Firefox          >300k          >300k
     Safari           >64k           >64k
     IE11             2047           5120
     Edge 16          2047          10240