I guess the title is self explainatory. It is not listed by methods('gpuArray') in the PC in am using. If the answer is no, then are there any sampling methods which could somehow be parallelised using gpuArray, including lhsdesign?
It is not supported. You can tell whether or not a function supports gpuArray, more reliably than from the list of gpuArray methods, by looking for an 'Extended Capabilities' section on the documentation reference page.
I cannot unfortunately comment on alternatives since it's not my speciality.