No. And yes. Well, it depends.
It could be. It depends on your spec. But:
The quality of connectors is vital. A precision connector like APC7 should be built to very tight tolerances. If it is not, it will give you reduced performance, mainly visible as increases S11 at the connector interface. This can swamp the DUT S11 and as such ruin your ability to accurately characterize the DUT.
But that is not the main issue. The main issue is that if that connector is not built to the right tolerances, it can (and likely will) damage the "good" connector on your VNA. And once that happens, there is no way to get high precision and repeatable measurements unless you replace the connectors on the VNA - and this will cost you a lot more than just getting high-quality adapters would have.
Chinese cables and connectors can work fine for basic stuff - especially if you know where to look. I use them all the time! But I clearly mark them and they only get used with adapters that are sacrificial and on connectors that don't have as tight tolerances as APC-7 in the first place. The N-to-SMA adapters (rosenberger or huber+suhner).
In the case of the adapter you list: just look at the surface finish of the (supposed to be) teflon in the SMA connector. Or how dull the suposed-to-be-gold-plated contacts of the APC-7 side are.
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