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In my book, the following reaction is given

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The solution states that the sigma bond between hydrogen and carbon (3 degree) in isobutane attacks $\ce{H+}$ from $\ce{HF}$ to generate tert-butyl carbocation. This carbocation then adds on to ethene to generate another carbocation followed by some rearrengements until the given product is obtained.

My doubt is, since pi bonds are stronger nucleophiles (because of loosely held electrons) then why in this reaction the carbon-hydrogen sigma bond attacks $\ce{H+}$ instead of $\ce{HF}$ adding to the pi bond?


Source: MS Chouhan; Advanced Problems In Organic Chemistry; 11th ed; Ref. Q.26 MS Chouhan - Alkenes

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