No

A cyber attack is a cyber operation, whether offensive or defensive, that is reasonably expected to cause injury or death to persons or damage or destruction to objects.

Michael Schmitt et al; Tallinn Manual 1.0, pp 92
  • Cyber Operation?
  • Expected to cause death or injury to people or objects?
PLA-linked-Naikon’s Espionage Operations Across South East Asia does not match this definition. Here's a list of actual cyberattacks and and why this matters.

What happened?

Hackers linked to the Chinese military conducted an espionage campaign targeting military and government organizations in Southeast Asia beginning in 2019