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Loreal scales can vary; I have some pure argentines with one, and it is not unknown to happen. It looks to be a pure Argentine to me and I don't see any sign of it being a cross.
I think one scale argentines are just flukes. Whenever they are developing they just develop one scale for some odd reason. It might be a recessive trait.
Some just come out like that from time to time, I do not think it is a trait at all. I think it is just a variation that happens from time to time. The scale pattern on every tegu is different and no two are exactly alike, kind of like people, we all look different and no two are exactly the same in every way, not even twins.
Here is a 100% pure Argentine, note one loreal scale: