The bar has to extend to cover the front tyres......basically, as per the full size bars on the market. I don't believe stubby style bars are technically legal anywhere in Aus.
I don't believe you'll find that any Smittybilt bars are sold as "airbag compliant".....I've never seen that in the advertising, .....except the Smittybilt Atlas front bar which is marketed as complying with pedestrian safety regs internationally....no mention of airbag compatiblity specifically, though.