This doesn't actually affect anything if you're accepting Tailscale SRs. The conflict the article states is accepting a route advertised by Tailscale for their local network (the SR route) while on the local network (same network as the SR route). This forces all traffic through the wireguard interface, then it's routed to the SR and then back out because the interface metric is better than the hardware because of the link speed advertised. This is the root of the bandwidth issue.
The "Allow local network access" is an IP filter that's put into place or not.
The "Allow local network access" is an IP filter that's put into place or not.