Okay, that's more of a grey area I guess. Personally, I would say that it's still under construction because it hasn't opened yet, but that's also not something worth debating over, so if you disagree, that's fine. I would probably add a note about why the trail is still access=no so people aren't confused (because it doesn't say anywhere online that it's done with construction)

Either way, you did mistakenly leave the construction=footway tag on the path