Two points:

1) The panels being de-commissioned now aren't modern panels, they are 20+ years old. They were substantially less efficient (per square-meter) than today's panels when they were new, and they (probably) are aging worse.

2) A lot of these "the solar panels have to be deconstructed for economic reasons" arguments are the same arguments as "Coyote v. ACME has to be destroyed for economic reasons". The reasons are completely fake; designed purely to feed Moloch.