Discovery+ is the home of reality TV, featuring content from HGTV, Food Network, TLC, and Discovery Channel. Content libraries differ by region, with the US version offering the widest selection. A VPN unlocks any regional library. The reason for this is structural: streaming services license content country by country, and Discovery+'s catalogue in each market reflects whichever distribution deals were signed there. A title that's available on Discovery+ in the US might be on a competitor's platform in the UK, or vice versa.
A VPN sidesteps the geography problem entirely. Discovery+ sees the IP of GhostShield's exit server, not your real one, and serves you the catalogue for that exit region. The streaming app makes no distinction between a 'real' local user and a VPN-connected one as long as the traffic looks like residential broadband — which is exactly what WireGuard with ChaCha20-Poly1305 over GhostShield's network produces.
What you can't do is bend the laws of physics: a stream from Discovery+'s origin servers will always have more latency from far away. Pick the GhostShield server closest to Discovery+'s data centres in the region you want, not the one closest to you.