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replaced http://meta.rpg.stackexchange.com/ with https://rpg.meta.stackexchange.com/

Yes, it makes sense.

It means the question being closed as duplicate is off topic, and should be closed anyway, as the lock banner of the special historical lock says:

This question exists because it has historical significance, but it is not considered a good, on-topic question for this site

So, it's either just closing (and deleting) as off topic or closing as duplicate, which keeps the newer question alive and searchable.

As for the reason why it's off topic in the first place, MSE is not the proper place, and it's better be asked and/or discussed in the per site meta, e.g. in your example it would be https://rpg.meta.stackexchange.com/