The technical length limit for a URL is a little over 1000 bytes. And that's only because of Microsoft's IE. It may have changed in more recent versions. Firefox and others handle urls over 4k in length.
The recommendation they are giving is pointless and should be ignored. Especially since it's a search URL that really shouldn't be picked up by a search engine anyway.
Every "site checking" site has quirks that can be ignored. This is one of those.
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