You left out the important line above:
“... starting January 11, 2021,” quoted from the letter obtained by Kompas.com, Monday (11/1/2021)."
This is all old news from the time before the FDR was even found - let alone downloaded. At this point, they basically had no facts about the accident and thus triggered the most generic news release - basically saying they will look into everything (maintenance, ADs, pilots, training, ...). No surprises there.
It'd be more interesting to know what actions they decided to trigger after the FDR was found (12/1/2021) and after its data is downloaded (13/1/2021)...