As you've probably seen, there is an option called 'Some other RISC OS computer' as well as VRPC (which is a further developed version of RedSquirrel). Unfortunately, the specific option 'RedSquirrel' is missing, for good reason I'm sure.
What defunct hardware? If you actively use a machine, even if it's 2000 years old, how can it be defunct? If you can install and run modern software on such an ancient device, how can it be defunct? On the other hand, all native RISC OS machines run on defunct hardware ...
The poll is "an interesting experiment" - only an idiot like me would take its findings seriously.