It’s true, and briefly made the news at the time[1]. The CSRB was also decimiated, and the current DHS deputy secretary, in his confirmation hearing, called for wrecking the agency, as he disagrees with their efforts to maintain election security.
I definitely remember DOGE gutting CISA. Other cuts were not always due to DOGE. A good chunk of the FBI's computer security and counter intelligence people got reassigned to immigration enforcement. The committee investigating the US cell network hacks got cut extensively but I don't remember who did it.