It's a rather weak piece of writing. There are references to Savile, Prince Andrew, Jeffrey Epstein, the Irish dirty war, etc... which have nothing to do with Mountbatten. A Hoover-era FBI dossier is not strong evidence of anything. Homosexuality & bisexuality weren't distinguished from pederasty.

Much of the rest is speculation & innuendo.

Was Mountebattan a pedophile? No idea. No opinion. But this article certainly hasn't contributed to that topic in any meaningful way.