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That's one type of autism. The reason it's now called Autism Spectrum Disorder is because there are many very different manifestations, not all of which involve hyperfixation.

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It's not hyperfixation exactly, but a requirement for an ASD diagnosis is some forms of "Restricted, repetitive patterns of behavior, interests, or activities" (from the DSM-V).

This is one of four criteria listed in section B, which only requires two to be present. See https://www.cdc.gov/ncbddd/autism/hcp-dsm.html

So it's still possible to receive a diagnosis if you don't have hyperfixation but have two or more of the other section B criteria.

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