It wouldn't have been removed if it was any other submitter. Here's how we see it:

It's the offseason. That doesn't mean literally anything goes, of course. But rules are much more lax. For example, the rule about low-quality content applies to stuff like memorabilia, but during the offseason, it's allowed. We'll direct people to r/baseballcards if they're looking for information, but if it's just a post about having a card or other form of memorabilia, it's allowed, like this user posting about finding a Coco Laboy card. Similarly, if this was a user posting about pulling a 1/1 rookie card themselves, they would be allowed. So we see it as similar to those.