Not on the A320 or A321 fleet. They are carried on the A330, which of course carries QF equipment, and therefore has defibs.
Now of course JQ don't provide or pay for the training or renewal. A First Aid Certificate (or proof of registration in a course) is required as part of the pre-employment checks. As for renewals - it may be policy hidden somewhere, but it most certainly is not enforced nor ever checked. Actually, if an applicant provides proof of enrollment in a course as part of the employment application process, its never actually checked to see if they then went on to pass the course or even attend it...
ALOT of hosties running around under the star without a current First Aid Certificate, or indeed training...
As for the communication issues....... Raised a number of times by a number of different ranking folks (even passengers...). All very cleverly dealt with by it being insinuated that the complainant might just be racist....