There's a yellow notice on this page noting that OpenWRT should not be installed on Archer C7 V2. Scrolling down, this can be seen:
The WLAN↔LAN throughput of Archer C7 2.0 with OpenWrt Chaos Calmer RC3 was measured to be substantially lower than that of the native firmware.
At the same time there's a different page dedicated to Archer C7 v2.0, e.g. https://openwrt.org/toh/tp-link/archer-c7-1750. It has no notes about perf issue.
Besides, there are many forum topic dedicated to v2. Here's a recent example – TP-Link Archer C7 Router AC1750 V2 Gigabit Througput Possible?
My question is – is that note outdated, or not applicable to newer versions of OpenWRT, or did I misunderstood something about it?