Years ago, I owned the Target shelf and used it with my SOTA. I didn't have any problems, but when I moved I didn't keep the shelf.
About eighteen months ago, I got a new Target shelf and used six inch heavy lag screws into a 2" X 6" stud wall. I noticed that the newer Target shelf was designed differently than my old shelf. The metal also seemed to be a lighter weight.
I placed my Raven One TT on top of it which is also a heavy table, but I don't think it's heavier than the SOTA. The front of the shelf flexed downward, so the front was about 1/4" lower than the back. The shelf was not pulling away from the wall. The lower braces of the shelf looked like they were pushing into the back brace causing the problem. I have a picture to prove it.
I tried to compensate by shimming the bottom back of the wall brace. This worked initially, but over time the shelf continued to drop. That was scary.
They just don't make things like they used to...at least not this shelf. I had to abandon the shelf idea, and I'm glad I did.