Nah. I'd be happy to be proven wrong, but this speculation here is taking off to an entirely new level (might be those scorching temperatures?)... It was a Monday morning tweet by them and they sometimes post stuff like that (motivational / "life" memes and pics). Just as many other banks / companies do.
I wouldn't read anything into it, especially as Targo isn't exactly a big player. They're tiny and not what Apple is mainly interested in. Others, such as Commerzbank / Comdirect, have already openly (in the press) said they would like to launch Apple Pay and they also were there right from the start with GPay. So they're the ones to watch as they are obviously breaking out from the general trend of either a) blocking Apple / Google Pay and b) only doing a proprietary Android NFC app.
Let's wait and see if we get an announcement tomorrow. None of the usual signs of a launch have appeared yet (such as adding German cards in Wallet gives us T&Cs, Apple Pay DE site, changed help pages, leaked stuff on banks websites). This Rudolf Linsenbarth guy is adamant that Apple Pay is coming in 2018 and he has been mostly spot on with other stuff. So I trust him with that information. Everything else is guessing. It's also fairly certain that Sparkasse/Volksbank customers (I also bank with Sparkasse) have no need to get excited. It's not coming. So if you guys want to play around, use your holidays, get boon. / bunq or N26 (the last two via workarounds) or any other foreign accounts (such as KBC) and enjoy Apple Pay over the summer