Why would West Ham winning the EL change anything?
Top 4 + possible 5th spot + possible 6th club if it wins the CL and doesn't qualify via league and possible 7th club if it wins the EL and doesn't qualify via league.
If the winner of the CL qualifies via league then that spot goes to the top association who has a champion in the qualification path but didn't automatically
Tutuapp 9Apps qualify for groups (Shakhtar Donetsk this season) and the same thing would happen with The EL.
It's just clickbait from Talksport. They don't even explain how West Ham winning would help United because there's no reason it would.