Presume you mean the £15 inflatable ones? I think all decathlon bodyboards are radbugs. We bought a couple, for 5 and 9 year old kids, for a holiday by plane where foam wasn’t a (sensible) option. They don’t have a rigid plastic bit, came in a pouch about 20x20cm.
They’ve loved them, albeit more as oversize pool float/mini lilo than ‘serious’ bodyboard. But that’s what they’d do with anything, just means I can’t comment on how good it is for that. More robust than your average pool inflatable but not at the level of proper inflatable SUPs/kayaks if that’s what you had in mind.
I wouldn’t worry about the odd scuff or bit of rough treatment but repeatedly sliding down dunes is probably pushing your luck. But I’d expect the same thing to snap foam ones in half so not sure that helps with which to get.