Earlier quoted context omitted.
The wind carries pollen from the crops long distances, where it cross-pollinates with other crops, some of which are grown from seed. This is a real thing that happens. There have been major court cases about it, like this one from Canada https://en.wikipedia.org/wiki/Monsanto_Canada_Inc_v_Schmeise...
If we understand "in the wild" to mean outside of farmers' fields, then rapeseed pollen flying from one rapeseed field to another nearby rapeseed field is not "in the wild".
By "wild propagation" I meant outside of the original controlled planting.
Propagating to another farm leaves the controlled area and now it's spreading in the wild.