Junaids is talking from a comparative level.
Better dip examples would be Amla (1st test) and Faf dismissals (2nd test).
Don't think he would average 30 in Australia ever. That ship has sailed. Dude averages 56 there playing 6 tests there.

At best he can try to make it 30s (mid or late 30s).
And there is a good chance he will continue to be carted around in Aussie pitches if pacers don't step up. Maybe he can come into play in those Adelaide, Sydney or any track with some bit of life but that's it. It was ridiculous to watch him bowl at 2 rpo while at the other end we were leaking at 5-6 rpo. Soon bowlers get tired and they too start getting smashed.
Swann was a performer in Aus and he averaged 39 there. Its a brutal place. At best an offie can hope for is match defining performances. Averages go for a toss there (bowling to Aussies in those pitches is damn hard). Lyon is respected for his performances in those Aussie tracks (I am a bit of Lyon fan too - beautiful action and tosses up the ball). I just wish he was better in Asia (dunno why he doesn't get results in Asia).