I don’t see Luke and Frodo as particularly similar. I agree this take seems like a stretch.

When Frodo settles back into the Shire, he is panged by guilt at his failure to fulfill the quest and faltering at the end. The jewel Arwen gave him becomes a substitute for the Ring, and he is disconnected from his peers. He’s a veteran, and suffers from spiritual wounds that can’t be undone.

At the end of Jedi, Luke appears to be and feel vindicated in his initiative to appeal to his father’s better nature and recall him from the Dark Side. “You were right, you were right about me.” He has his father’s blessing, and a sister to go on with. He has faced his trial and persevered, ready to proceed to the task of applying this elixir to a new generation of Jedi who will benefit from his growth.

I just don’t see much resemblance between these two, at least not at these points in their stories.