I've never heard anyone pronounce it as rooter in Australia.
While this may be emerging as a 'new norm' among younger and more IT-fluent crowd, it's historically abnormal in Australian English. For evidence, see for instance https://dictionary.cambridge.org/pronunciation/english/route... ... noting that Aussie English follows UK English in nearly all matters, and that the Macquarie Dictionary (which is the reference dictionary of Australian English) does not, unfortunately, have a free online edition.
A fellow Aussie statement on the matter concurs with my take https://forums.whirlpool.net.au/thread/3yjjxp59#r7