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It's a FUD piece to some extent. DoS attack vector can disrupt to some extent, sure. The risk of losing funds is not there unless node operators go offline for a long time without watch towers. He talks about liquidity issues but doesn't point to any numbers.
Here is another article by the same author:
"Certificated anti-money laundering specialist in the crypto industry, member of Blockchain Ukrainian Association. Founder and CEO of AMLSafe and AMLBot.” Maybe lightning is making life harder for his company?