These trains are fairly reliable at taking the booked route, as far as I know.
The one an hour earlier (2053 from Sheffield) has always gone via Meadowhall, Rotherham Central and avoiding Swinton, as booked whenever I've done it, which is quite a few times.
I've not done the 2154 from Sheffield very often, but when I have, it's gone via the booked route via Tinsley (avoiding Meadowhall), Rotherham Central and avoiding Swinton.