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Nope that was still all the way from the start of heavens arena arc, besides Killua just took an example.

Reasons: Hisoka never showed his real abilities back then in fact even now we never see his full potential but he was consider a powerful being in the series.

Another reason is Hisoka never uses his Nen abilities in the Hunter exam arc, if you think he uses his nen way back when he fought an examiner w/c was happen all the way back in the trick tower then you have to consider that Killua never actually saw that fight and i doubt he uses his Nen in that fight, remember Hanzo at that time doesn't know what Nen is right???

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