Fair enough, but the silhouette graphics on the banners are being taken from Everton's own in house honours graphics prevalent on the club website. That's where they've come from.
People can be pedantics about it, but ultimately it represents a trophy we won.
We won the league 9 times, but on one of the occasions (1985) we were only presented with the Canon league title trophy and not the football league championship trophy that we would receive in 1987.
Because of that, do we say we only won the league 8 times because of that? Of course not.
Likewise, even though we never received that trophy per se for winning the 1931 Division 2 title, it still represents the 1931 title win.