See my earlier post re goth influencing Sr meta to the point where no viable ho-oh team can outplay Sr techs.
ho-oh is ridiculously rocks weak and have absolutely terrible match ups vs bulky goth balances that dominates the metagame right now. goth basically removes all of the possible defoggers outside of darkceus/ghostceus/gira-o/a. the remaining defoggers are extremely weak to marsh/yveltal meta. In short, ho-oh's viability is directly correlated with defog capability of other pokemon. the defog capability is simply too low for ho-oh to justify any team slot outside of few niche teams that it can work on. ho-oh appears great on paper when you don't factor in metagame trends for hazards. ho-oh rating has been inflated for 3 years straight anyways.
OK, so then, right of the bat, what you are saying about bulky goth balances, which are supposingly "dominating the metagame", can't be considered: if you take snake draft, only four games out of 15 were featuring goth, and even then, out of these 4 games, the goth player only had a 50% win rate (whereas Ho-Oh build were able to win the 2 games where they appeared).
Then, in your post, you are only talking about 1 bad match-up: the one versus goth. And while it is true that goth give Ho-Oh trouble because of its ability to remove defogger, Ho-Oh is great versus a large amount of other playstyles, such as offense (where is it, after rocks are being removed, able to check a large number of threats with its defensive set, namely, M-Lucario, Marshadow if not rock tomb, Deoxys-A ( Who can't OHko it with Psycho-boost and a modest nature under the psychic terrain, while the bird can immediately switch out and regain its health), M-Gengar, or also Yveltal), balanced and stall (where is it able to punch huge holes into the opposing team thanks to the choice band).
In conclusion, while it is true that the rise of Goth does dent Ho-Oh's viability, it still does not mean at all that Ho-Oh is as good as mons like Solgaleo, which is outclassed in nearly every way by Magearna as a bulky pivot, and by Mega-Scizor as a sweeper, or Dugtrio, which only works against weakened Primal Groudon and Magearna