Statistically your supposition is plausible.
More likely is not so much OVERT sabotage but shoddy PM work or LOTS of FOD from the airports they serve.
I’ll go with FOD coupled with poor inspections.
I was thinking along those lines as well.
Who’s doing their engine overhaul work or is it being done as required?
FOD on the flightline is a very common and real possibility.
The engine will be inspected and the cause found.
Qantas seems to be having a good run of bad luck.