I am not sure funding is the only limiting factor.
I thought they had difficulty finding enough suitable candidates.
However I am open to being corrected.
I can't speak to the funding, but as far as I know, our simulator and instructor resources are at 100% capacity. There's only so many simulators, and each need a plethora of support staff, (not instructors or ATCs), to run them. To commission a new simulator would cost 10s of millions, as it would require a large capital investment: a new building with space for the required "mainframes" to run the simulator and more Eurocat or tower consoles, (computers), of which only a finite number of Eurocat consoles currently exist. If we did start commissioning one right now, it would likely not be completed before the introduction of CMATS/Onesky, (late 2027 at the earliest), and would be of no value to the company after this.
You need to hire and train the support staff to run these, which takes months to get them up to an autonomous level. Finally, you need the staff to teach the trainees. These
must be current or recently licensed controllers of some sort. Usually retired controllers, or current controllers seconded into the job for 24 months. Just as you wouldn't want me teaching a Qantas cadet how to fly a 737, you need specialised technical experience in this job to teach others. While I'm not at this stage of my career yet, but there's not a huge number of retired controllers lining up to teach students for what is a decent pay-cut, and to second a current ATC, you of course need someone to replace them.
There's no shortage of candidates, but with an attrition rate of training being 50-65%, and the bottleneck being training resources, there's only so many trainees you can push through the pipeline at once.
The company could definitely make the job a little more attractive, (and get better quality trainees in as a result), by improving the training salary. It's currently ~65k from memory, for the first 12 months of training. Prospective trainees often need to move interstate, leaving them unable to rent a place in Melbourne without roommates, all while studying an incredibly demanding and all-consuming course. To rub salt in the wound, working a second job is forbidden due to the demanding nature of the training. While this is often fine for your fresh out of highschool or uni trainee, these conditions alienate many people with a few years of professional work experience in their early to mid twenties, who historically do quite well in the course.