I'm not sure there is a difference between those things in the German law.
As I said, in Germany the price tag is a mere price suggestion, the final offer and transaction happens on checkout.
In my case it was an electronic article, where the price tag showed a much lower price and the cashier then demanded much more. But it turned out that they can do that.
Well... In Germany apparently they can.
The price tag is not binding, it is a mere price suggestion. The final price is the one when you actually buy it at the checkout.
Haggling is legal in Germany. The cashier is making the offer.
Wherever it is discrimination or not would probably depend on the metrics used to decide the price.
If someone is really desperate for an article, then I could imagine that the cashier can raise the price.
But I am not a lawer. This is just my assumptions on how it could be implemented.
And if they do it on an individual basis.
Like do they detect that a shopper is in a hurry, or if they just need one more ingredient for their cake so they are willing to pay more.
Sure... If you even notice it. And if enough people will care and if there are still stores around that don't do that, clearly superior profit maximising scheme.
I'd rather want this stuff to become illegal. So calling your representatives, make news and go to the streets about this would I think help more that yet another boycott.
Issue is that haggling is actually legal in many countries.
So at the cashier they will make you an offer, which, if you pay, accept.
Now with technical support making individual offers becomes pretty easy and effordless on their end, but if you are in a hurry you don't have that technical support to make a counter offer that effordless... So the shopper is at an disadvantage. Either way, your reaction, wherever you buy or not will train the AI of the store to extract the maximum amount of money of the broad customer base. If some people are priced out of living, they probably don't care.
In Germany the price is actually set at the cashier, not the tag. I found that out the hard way once, where the price tag was wrong and I had to pay more.
So dynamic pricing wouldn't even require deploying these smart tags, the cashier or the 'smart' self-checkout could just do it on their own. They could just use their cameras, analyze your face to figure out if you are in a hurry or not, or in any other way willing to accept a higher price and then offer you the ware to something you are probably going to accept.
The future is realtime individualized price gouging.
https://www.focus.de/immobilien/wohnen/falsche-preisauszeichnung-muessen-sie-trotzdem-den-richtigen-preis-zahlen_a0f9868d-30c0-45f0-b25e-27893a11b914.html
To me, that the price label is accidental wrong doesn't really matter.