This is still what it says on the elephant FAQ site of Zoos SA:
The initial two female elephants that could come to Monarto Safari Park are past breeding age.
Putra Mas (male) has already played an important role in the species’ regional breeding program, introducing new and valuable genetics into the pool. In 2018, he sired a calf through artificial insemination resulting in a female born in New South Wales. Putra Mas is still in his breeding age.
As we move to expand our herd we will work with the Asian Elephant Regional Breeding Program to increase our breeding capacity.
Which in and of itself is somewhat outdated - it's confirmed Monarto (all being well) will be receiving Burma and Permai, as well as Pak Boon and Tang Mo from Taronga.
It's a reasonable inference that there are plans to breed Pak Boon with Putra Mas (as she would be the only cow able to breed of those Monarto is planning to receive. I agree, though, that it would be nice for the zoo to confirm that this is their plan, just in case we are getting the wrong idea.
Funnily enough, when I Googled 'monarto breeding elephants', this was the second search result:
Jumbos stuck in holding pattern
It refers to Monarto, as well as Perth, Auckland, Melbourne and Taronga, being part of the future plans for a regional breeding population of 40 elephants (written in 2005).