I shop once or twice a week. I wear a mask and use the hand sanitiser before going into each shop.
I have never wiped down the cart or basket, nor wiped purchases before putting them away when I got home. We have never been advised to do so in Denmark where I live.
I keep the regulation distance of 2 metres away from other people. Don't stop to talk inside the shops, but do so on the parking lot.
DH follows the same rules, but not all of those we talk to do.
We are both fully vaccinated and have never at any time tested positive.
I think we all need to remember that the advice given was originally advice that would have been given regarding any infectious illness that had reached epidemic proportions, as no-one really knew how this virus would behave.
An article may be newsworthy without being written as a result of academic research. To know whether one or other sector of the public is more likely to catch covid 19 depending on when or how often they shop, as the article apparently claims, sounds a little dubious to me.
Being used to academic use of statistics I know there are many factors to take into consideration, such as, who are these shoppers, what age-group are they in, how is their general health, are they vaccinated or not, are they obeying restrictions or not. Do they use hand sanitiser both on entering and leaving a shop?
I could go on, but I am sure you have got the picture by now.