I think that fria spoke in general, unless you can prove that there is no tampering with the firmware (even if the software is FOSS), you have no way to trust a router 100%.
Realistically, if you don’t have strangers coming in and out from your place on a daily basis, you should be fine.
Moreover, most people just go on the Internet with the most insecure and default box from their ISP, hence anything with OpenWrt on it will be better than the defaults and a significant jump in security.
Yet nothing will be ever bullet-proof and the hardware can still call home etc.
So yes, depends where you draw the line. 
I’m fine with having it a fully-wiping the default ROM and having OpenWrt on it.
Good enough for me. 
Yet, secure boot sounds quite cool too if enforceable but I am not sure a lot of devices from this list support that.
If you have the money and need, why not enforcing that one indeed. 
More peace of mind, datacenter kind of security haha! 