I believe the comment was highlighting the advantage of a router vs a local DNS service rather than asserting the openwrt implementation has features beyond vs

I believe the comment was highlighting the advantage of a router vs a local DNS service rather than asserting the openwrt implementation has features beyond vs the pihole implementation. The advantage is the router itself is literally routing all the traffic and thus even hostile clients (e.g. smart tv) that ignore the (dhcp provided) pihole DNS still have to pass their traffic through the router and thus it always has an opportunity to take action on the packets. As was mentioned in a sibling comment, even with just a pihole and a non-openwrt router you can still configure your network to force all DNS traffic through the pihole but it is more config and more error prone vs the single openwrt router network.