Maybe just in
BTC or for a certain article, who knows but the interesting thing is, that there have been seized 3 times more Monero then
BTC --> if that is true

It would only be interesting if 1 BTC = 1 XMR. As Febo explained, these figures show that BTC transacted 70x more volume than XMR. Prices on the darknet are still set in fiat..
Also, nowhere does it say how much was seized. Just transacted.