I think the idea of the teams creator is a bit uncertain seeing as the team was literally what the standard offensive sand team looked like in the previous metagame.
Nonetheless it is an incredible team to play offensively beating almost any playstyle.
However walls like tangrowth with regenerator look quite tough to beat being able to recover off hits with ease and not caring much for hazards.
Having watched a user, by the name of Jamy on PO, use this exact team (but with an expert belt landorus) and peak No1 for many weeks at the end of the round i think that an expert belt landorus with smack down would be an excellent wallbreaker for the team, taking care of skarmoury, bronzong and gliscor which wall excadrill and being able to afford not to predict.
Landorus makes an excellent check to an unboosted volcarona even with expert belt and with the fast paced momentum of the uturn strategy it shouldnt find too many opportunities to set up. If all goes wrong excadrill could always have revenged in the sand.
On tyranitar if cm latias can set up on pursuit it will definitely find it a lot easier to set up on stone edge, so i recommend the use of crunch over stone edge, i would also run some attack evs to compliment this and give tyranitar a chople berry to better take on OTR reuniclus.
As for updating the team for the new meta, i think a choice banded terrakion over excadrill would be best for its wallbreaking power which many teams have no answer to, hazards shouldnt be too much of a problem vs stall as with good prediction terrakion will put a timer on your average stall team anyway. If you are using cb terrakion keeping landorus scarfed would probably be best, as would giving tyranitar crunch and chople berry to take on the ever common deoxys-s lead.