Intellicenter quick wire size question

The sticker on the IntelliCenter is below.

The Load Center specifications says its maximum is 150 amps so you would think the feeder cables can be sized for 150 amps which is 1 AWG and 0.2893 in.

2 AWG aluminum is 0.358 inches and may not fit.

The label also says Use COPPER CONDUCTORS only.

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