The construction gone to X in your example isn't an adjectival / participle element. That would be the case with something like He is pleased with the gate, He is attached to the gate, etc., but in your case it's a straightforward verb clause using Present Perfect He has gone there as an alternative to Simple Past He went there.
Note that in speech this isn't always obvious, because we routinely contract both has and is to 's (He's gone = He has gone, He's here = He is here).
OP does have a point though. There are a few "fixed expressions" involving the past participle gone that native speakers might sometimes treat as fundamentally "adjectival" rather than being part of a normal verb construction. For example,...
1: The director is gone to lunch.
2: [Some plant] is gone to seed.
I'm not necessarily defending the above usages, but I did find them in Google Books. And it's worth noting that one of the written examples for #2 has the "pseudo-adjectival" element in scare quotes - this is primarily intended to identify gone to seed as a somewhat idiomatic usage that might not be familiar to all readers, but the fact that those words are "set off" in that way makes it at least somewhat more acceptable syntactically to treat them as a "self-contained" adjectival element.