Not feasible = not willing to pay the cost
Unfortunately, I think it’s actually not feasible - the mussels are established throughout the entire lake, and not localized to a single area.
They had their chance with the curtain, it failed, and even that was kind of a Hail Mary.
Nono, it could be done. They could spend the years it would take to develop a method that would work here. They could hire a stupidly large labor force to physically remove the adult specimens and find a solution for irradicating zebra mussel larvae. They won’t though, because they don’t find it to be worth it. These things aren’t impossible, the people responsible are just unwilling to give more than pennies.
No it’s impossible. What poison the whole lake is that a valid solution? Or maybe introduce a species that eats the muscles maybe they we’ll work. Has a highly invasive species ever been successfully removed anywhere?