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Yeah for sure, it could just be all that shop has in stock, or worse, could be that they think its an OK quality product to put on a mid drive cargo :S
KMC Z1eHX EPT narrow or wide (proper mouthfull) are very good value at around £16 rrp, they handle mid drives well, last long enough and are very quiet. Seen some full scale track chains being used but often noisey unless your chainline is hermetically inline.
From a distance it looks like a 7$ chain for a kids bike. Get an e-bike chain or if you're stuck with 1/8" then get a legitimate track chain.
The slack chain is truly egregious, honestly... really. So maybe I'm being a bit judgemental, but these mid drive bikes need to be is perfect working order from the chainrings back through to the spokes. A huge amount of torque is put through them.