Indeed, for now, I don't think there's a problem in terms of UNCLOS with the F-18
And this is not the first time a CV (and its aircraft) operates in our EEZ
So the only potential problem (if there's any) would only be limited to the safety aspect of the flight and not sovereignty issues...
As the writer on the NST article explained, the 'rights and duties of the coastal State' in Article 58 is limited to "sovereign rights for the purpose of exploring and exploiting, conserving and managing the natural resources" (Article 56)
In other words, economic rights, not security/military...
CMIIW
Bawean Incident and the latest Natuna case are completely different cases. You need to learn about the difference between territorial waters and EEZ
Maybe (which part/article of UNCLOS are you citing?)
https://www.nst.com.my/opinion/columnists/2017/05/241775/unwise-restrict-foreign-vessels-malaysias-eez