I don`t think one needs a tin foil hat to question the possibility of this being the reason for the crash ..........Article from 2018.
Container ships easy to hack, track, send off course and even sink, security experts say
New research from Pen Test Partners shows just how vulnerable container ships are to hacking--including being steered off course and sunk. Always-on satellite communications and general lax security practices are to blame.securityledger.com
Probably just a test run ....