This is a bizarre regulation if true. I’d much rather pay an artist $50 for 10 high-quality, well-done animations alone than to have that artist required to essential “pad” their asset pack with other stuff to meet the minimum number.
In fact that probably is another big driver behind why stolen assets appear on the marketplace, if their own limited set of stuff is turned down by an arbitrary requirement for asset count that they can bypass by including a few non-original/stolen bits.