There are indeed shortages in various areas of various things. And in my area, there might be something (beef) fully stocked one place and nothing in the store down the road, or fully stocked at a store on Monday, but on Wednesday, absolutely nothing in that category to be found. It's a hit and miss proposition on many things, in many places.
If a customer gets 'scared' because a host on a shopping channels suggests buying from them, rather than taking chances with what they may or may not find in stores, then the issue is with the customer and their inability to process/cope with their reality and their needs, not someone who is being paid to sell, telling the truth on air to make a sale.