I believe you, though I’ve never seen red onions in the store that had this little color. Makes me wonder what variety the commercial growers use, and why a different variety would be sold to home gardeners.
There are many varieties of onions.
Commercial growers tend to put shelf-life and portability above all else. That’s why store-bought tomatoes, unless locally sourced, taste like cardboard for the most part. ;)
My favorite red onion (in my Zone 5a) variety is ‘Redwing.’ Nice size, great flavor and stores/keeps wonderfully.
“(105-120 Day) The longest-keeping red storage onion. Bulbs store nearly as well as Patterson Hybrid. The glossy, dark red, 3-4” globe-shaped onions are moderately pungent, very firm and have good skin retention. Tops grow upright and strong. Long-day.”
You also need to know which onions grow best in your zone:
Long-Day, Intermediate and Short-Day Onions Explained
https://www.tinygardenhabit.com/long-day-intermediate-and-short-day-onions-explained/
Who knew that growing a simple ONION could be so complicated! ;)