No need to worry about the pollination issue. Pollinations is the mixing of genes for pro-creation of the NEXT generation. It doesn't effect the characteristics of the current generation.
IE, if you aren't keeping your seeds for next year then you have NOTHING to worry about.
This is bad information. Cross-pollination will affect the corn you are trying to grow. While you are correct that the current generation of plants you are trying to grow won't be affected, the fruit you are after is the next generation. You are eating the offspring.
I am growing 2 acres this year and I sell at the Henry County Farmers Market. I also sell bulk to local clubs for fund-raisers.
I had no problem with cross-pollination on my first planting last year, but my second planting was starchy due to the field corn in the next field. Both plantings were the same variety with the same fertilizer schedule and the same herbicide, they were just planted at different times.
The second planting was edible, it was just a little starchier and tougher than the first planting.