I believe that the intent of the RCMP "ruling" is so there would be only three possibilities for an 80% AR lower:
1. You have a block of aluminum that in no way is definable as being solely for the use to make a restricted firearm, that it could instantly be continued to be milled into something else like a carburetor block.
2. You have a block of aluminum that is definable as being solely for the use to make a restricted firearm, has characteristics of becoming a restricted firearm, but is not registered and therefor is an illegal prohibited device that will result in a lot of criminal charges being laid against you and the manufacturer and/or importer.
3. You have a block of aluminum that is definable as being solely for the use to make a restricted firearm, has characteristics of becoming a restricted firearm, but registered as a restricted firearm and therefor requires you to have a legal restricted PAL.
In the end you end up with option #3 and the only reason you would do a per-registered 80% AR lower is if you are doing a special magazine for a special upper, custom art work, custom engraving or the like. The RCMP "ruling" is to close any possibility of any 80% AR lower being unregistered.
So, yes, Dlask could do one and I can bet what they will say: "Only if it is registered to you before you take possession of it."