Percy Schmeiser intentinally sprayed his crops with roundup, something that will kill all but the ones with the patented gene, then replanted those patented plants. He was intentionally trying to replant the roundup ready plants. His fields where over 90% that cannot happen without intervention, the RoundUp plants have no survival advantage unless you spray the field with roundup; no farmer without RoundUp ready plants would ever spray their field with roundup because it would kill their plants.
The story Percy Schmeiser tells is a lie, no one else believes him. The judges that sided with him in is case still thought he was lying, they just didn't think the patent was valid.