You can boost using any Podcasting 2.0 app or LNBeats through Alby wallet OR, yes, you can boost the feed directly from your node using a protocol like BoostCLI.
Discussion
How can you verify that you are paying the right person? Is there a good way to know that lnbeats didn't add a malicious lightning adress?
It's simple: look at the splits before boosting, then compare to the RSS feed if you're paranoid.
Are those rss feeds published by the artist?
Depends. LN Beats surfaces all music RSS feeds, even those uploaded to platform -- which you'll recognize because there will be one single 100% split in the boost PLUS the WL symbol in the upper right corner. No symbol means the feed is self-hosted and published by the artist, but sometimes you'll see Music Side Project (MSP) or RSS Blue symbols. Those are decentralized too in that the artist determines the splits and their value is not custodied.