2021 BBM Glory Roki Sasaki - Is It A Rookie Card?

I came across an auction on Ebay recently for a "Glorious 3D" insert card for Roki Sasaki from the 2021 BBM Glory set.  The seller labeled it as a "rookie card" which I pretty much ignored since many sellers list ANY Japanese baseball card for a player as their "rookie card".  But when I looked a little more closely at the card itself I noticed BBM had labeled it a rookie card by putting their little "rookie" icon on the back.

Here's the front and back of the card (I swiped the images from the auction):

I did a post recently that listed all of Roki Sasaki's rookie cards.  I pointed out that he was drafted in the fall 2019 NPB draft so all his rookie cards were published in 2020.  Here's the hair splitting part of the question - the set this card is part of was published in December of 2020 but has a  "cover date" of 2021!  You can see the "cover date" on the back of the card - it's the little icon below the "rookie" symbol that says "BBM 2021" as well as the text towards the bottom identifying the set as "BBM Baseball Cards Premium 2021 [Glory]".  Of course, right below that you can also see a 2020 copyright line.

My inclination is to say, no, it's not a rookie card despite what BBM says.  The card (and Sasaki's base card in the set) not only has a 2021 cover date but there had already been about 10 previous Sasaki cards from BBM with 2020 cover dates that were as "rookie"  cards.  I kind of feel this one's just late to the party.

What do you guys think?