looks like a 1 bolt angle adjustable ..

7.4 FX - Trek Bicycle

maybe just not as easily adjustable as some aftermarket posts .. **

perhaps the bar height and reach is not right for the rider in question.

I have my saddles a smidge nose Up, so there is less slipping forward. all the time , like a nose down will have..

** I last replaced one on a bike [not a FX7] with a Cane Creek thudbuster ST,
which offers a bit of bump absorption. while offering setback ..