I’ve not noticed any lack of inventory other than the occasional absence of an item that may have been on sale and shoppers purchased what was in inventory. The only buying restrictions I’ve seen at a local Aldi’s is for some ‘on sale’ items. For instance, before Christmas they put their spiral-cut hams on sale for half price and limited customers to two. Nothing odd about that. Retail grocers do that all the time.
I’m on the East Coast and I’ve not experienced any inventory problems due to transportation or any other means. I can’t speak for the entire coast, but my area is awash with food items from both inside and outside the country. But, I’m not so ignorant that I don’t know the supply chain is vulnerable to disruptions from a multitude of reason.