This is not Fallout 4 New Vegas, which is a separate project aiming to remake NV in the Fallout 4 engine from Bethesda, but it's still incredibly cool. It's a script and mod from 'bololo11' that ...

Josh Sawyer says Fallout: New Vegas has deathclaws in Cazador as a warning to Fallout 3 players expecting another easy ride: 'You can't just slide all over the map and not feel the heat ...

For your New Vegas in Fallout 4 fix, well Fallout 4: New Vegas still appears to be in active development as of November 2024. I'm perfectly happy with the original game (plus a few mod fixes) though.