Seeing as the delivery zone for the park is right next to the area, it is not out the realms of possibility that this has been delivered to the park by courier for one of the parks many Zamperla rides. This is more than likely what the part is for.
The park do watch social's very closely though, they also seem to be on top of their game when it comes to socials too. So it is not out the realms of possibility that said part for an existing attraction, was placed in the construction zone on purpose to hint at the manufacturer. They know it will do exactly what it is doing now, drum up communication in the enthusiast circles, free but small PR for the park. I mean, the hint of the manufacturer for Thorpe's new coaster was confirmed via branded celotape, on their socials. They could be doing exactly the same here, just using parts that are not for the attraction, but carry the name of the manufacturer.
I mean, they have placed said frame in quite a 'prominent' position on the construction site, almost as if they wanted it to be seen, there is a very big storage area close by, behind Sherriff's, they have consciously chose not to store it there, all seems a bit suspicious to me.
The cost of this does seem supported in the hardware cost as seen in the recent financial reports, as Zamperlas are quite cheap in the grand scheme of things, especially when looking just at the hardware and un erected cost. Both would not be miles apart in that respect, obviously, it is difficult for an exact total as we do not know if this coaster is custom and to what extent it is.
Connections to dots can be drawn by this, are they the correct though? Who knows.