My guess is the weight rating is due to the plastic construction, so I’d avoid as a heavyweight. Any particular reason you’re looking at them? Rollers have a very narrow workout usability and the ~400 watts of resistance isn’t much. A trainer would be a far better investment if you don’t have one already. If you do, just get a set of more sturdy rollers without the resistance unit and play with tyre pressure. You can get a whole lot of resistance from low pressure tyres on rollers.
FWIW I have a set of the Cycleops rollers. Basic AF but they do the job. They only get used for track racing warmups and cool downs. The trainer gets used for everything else