My mom lived in a historical house when she was a kid in the 60s. Since then, the house has become a museum. There are a lot of "artifacts" on display that "came from the 1800s" that are actually just toys my moms brothers made. My mom got a good laugh about it when she took me to visit the place.
I'm sure these finds must have dated in some way to verify the authenticity, but I always think back to seeing my uncles toys on display as if they were historical artifacts when I see stuff like this.
A lot of these historical house “museums” are a pleasant diversion for tourists more than anything else. Note how they are all haunted - ghost tours are pretty easy money
I have never come across a house museum that claims to be haunted. Must be a cultural thing that doesn't exist in Belgium. Possibly because loads of things are ancient here anyway, no need to embellish with more nonsense I guess.
Dating is done with more than just material analysis. Evidence of tools used to make the toy, techniques for things like joins and stitching, etc. can all be indicative of methods that can give at least a lower bound. How applicable method differentiation is to this specific case obviously depends on a number of things.
With his rhetorical question, he's saying it must be malice because no museum operator would be that incompetent. They're actively making a false claim to their customers. They could have just not said anything about the age of the toys since they know they didn't verify it. I think you can see this must be the case since you didn't answer his question.
In my country, if a business makes a factual claim about its products, it has to have already verified the correctness of it to some reasonable level and have the documentation so show that. There's no room for this "oh, I just assumed it was true because I'm incompetent" excuse.
What I can see is the case is that you're both way too confident in your inferences for a bunch of mind readers. Why not just call them up and find out? Oh right "not my job".
And btw "no X could be that Y" last time I heard that line was in a sitcom.
I'm sure these finds must have dated in some way to verify the authenticity, but I always think back to seeing my uncles toys on display as if they were historical artifacts when I see stuff like this.