It looks to me like they applied for all their items to go onto the sale but it’s rare for an author to have their entire collection included and perhaps this collection and banners were a bit presumptuous.
Those banners are not from envato I don’t think and look like something the author added.
Best option would be to use item comments to ask the author why the items are not discounted/included in the sale.
The links you provided are only for a specific author’s items and the author is doing false advertising only for their own items. Discounted items for Mid Year Sale are selected by the Envato team and it is hand-picked (only the most quality items).
You will get the full list of CodeCanyon’s discounted items here: