I don't doubt that. People believe all kinds of things. Just because someone believes something doesn't make that thing true.
For example, "those people" might have conjured up a notion of a creator in their minds and a unique variation of an evolutionary model. The Islamic god is said to be a creator, and I know of a few imams who claim that evolution was one of the mechanism used by Allah.
Orthodox Christianity teaches a literal six day. Granted there are those who don't believe Genesis 1-11 and Exodus 20:11. Selectively choosing to believe the Bible doesn't change the fact that the doctrine recognizes that it was accomplished in six days.
Of all of the various Evolutionary theories abounding out there (PE, Classical, Catastropy etc.) none of them are compatible at all with "those people" who have invented a "Theistic evolution".
So "those" people don't believe in the orthodox doctrine of Creation or in the current variations of Evolutionary theories (that which is taught in schools), but some wierd convoluted mutant that is in violence to both theories.
Again, I submit that True Creationism and True Evolution (whataever the acceptable variety) are mutually exclusive.
So, when Genesis speaks of God ‘creating’ man from the dust of the earth and then ‘breathing’ life into him; when it speaks of creating the animals that will reproduce according to their kind (not making new kinds), where is the ‘evolution?