I appreciate that the seller of this wheel is willing to stand by it, even though I am annoyed at their poor product description. They could have just ignored me, or run me in circles with bad support, and they didn't. So I won't name them here, I don't want to trash them.
But I told them this: I can't even imagine any bike this kind of 9-cog freewheel would work in, without multiple other weird kludges! Why not just sell a 7-cog version and leave it at that? Because if my bike had 9 rear cogs from the factory, this wouldn't be a straight swap into that either. It would still be too wide for the dropouts, and the indexing would still fail. Every buyer will be unhappy since there's no good use case for what they sent me! They need to not do this!
If the 9-cog freewheel I ordered on Amazon actually has the right cog spacing, I'll write back to the company that sold me this hub motor wheel and let them know of it. They could switch to that and make people happier.