There are preheliocentric models of planetary motion that fit with the observed data perfectly well, but they require a bunch of qualifiers and exceptions. But if you just say, "Wait, what if the sun is in the middle, and the rest of us are just orbiting it?" then you suddenly have a very simple model that elegantly predicts where/when everything should appear in our sky.
Likewise, if you start making exceptions and qualifiers to your definition of what a baseball card is, it just looks like picking and choosing what one feels like calling a baseball card and then scrambling after the fact to figure out what definition could fit the data. All of which is to say he's right. The definition needs to be independent of what year the card was produced.
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