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I like to view it that we're all RNA-based lifeforms. Operationally: DNA, RNA, or other are just a vehicles which hold our information.

This podcast RadioLab with Carl Zimmer (11m) I think captures the essence of the idea near perfectly: https://radiolab.org/podcast/creation-translation

The premise of TFA is that we're treating viruses and virus-like things as a class of lifeform. There are RNA viruses, and these obelisk things are also RNA-based. Presumably that's what OP is asking about with regard to RNA-based lifeforms.

> There are no RNA-based lifeforms.

There are viruses that have entirely RNA-based lifecycle (even using RNA-dependent RNA polymerase). Our very favorite COVID virus is one of them.