Walmart would lie about it being synthetic? Is it actually 5W-20 or 5W-30? The only Toyota branded oils I' ve seen at the dealer are synthetic 0W-20 and conventional 5W-30.
Walmart's inability to properly mark and price their on line stuff with regards to oil might be well documented on this site. People order a (3) pack of gallon jugs, pickup in store and it turns out to be (1) gallon jug. At this point I pay no heed to 'great deals' from Walmart, (like this one) because it tends to be a pricing error or incorrect description. Amazon occasionally suffers from this as well.
My local walmart occasionally puts oil on the clearance shelf, red labels with almost the exact same price as when they were on the shelf.