They dig but these are the smaller hoplo cats (hoplosternum punctatum), maximum 4-5 inches if you count the tail. I find their digging no worse than my cories. Well established plants aren't dug up, but they do get freshly planted ones
The larger hoplos are worse diggers. The smaller guys are pretty much the same as cories with the digging.
I keep mine with vals, hygro, moneywort, crypts, taiwan lily, and swords. No problems from the plants that have full roots, but newly propagated will be dug up. Thats the same with my cories though.
Bigger species... then you'd have a problem with small stem plants.
But if you have carpet plants like monte Carlo or hydrocotyle tripartita, or hairgrass... yeah say bye lol but even small corydoras will dig those out.