Helion has had “a working power-producing system in five years!” since 2017.

Before using wrong a plural in a language you don’t know, just use an anglized plural, octopuses (or octopusses).

Afaik, octopodi would be correct as 'pus is actually derived from ancient greek “pous” meaning foot (latin would be “pes”). And even in Latin, not everything ending on -us has -i as plural.