I'm not clear on what you want to do and I'm not familiar with TP-Link but here goes.
1. HyppTV doesn't use NAT so I'm not sure why you're asking about this specifically.
2. NAT Boost affects the whole router. On will disable speed limit (and QoS). But off or on should have no effect on HyppTV traffic.

On a my router, a Mikrotik, same thing applies.
1. NAT Boost called Fasttrack here also must be off for any QoS or speed limit to work.
2. HyppTV traffic is accelerated (not for increased speed, more for less CPU usage) by another component called Fastpath. This works even when Fasttrack is off.
3. There's a 3rd way and that is to offload HyppTV traffic to the switch chip. This is the fastest, practically 0% cpu usage.

....rather than paying less to a manufacturer that practices "Sell & Abandon" business strategy that leaves their customers using routers that has tons of bugs & living in fear because of security holes that is never patched

....rather than paying less to a manufacturer that practices "Sell & Abandon" business strategy that leaves their customers using routers that has tons of bugs & living in fear because of security holes that is never patched

Hi there,
...…...

We will provide firmware updates when there is an issue discovered with the firmware or when we are adding new features to the router.

Thanks.