It's not a false scarcity, the scarcity is one of opportunity. Check out the concept of opportunity cost; if you're not familiar it can be a paradigm shift for worldview: https://www.investopedia.com/terms/o...tunitycost.asp
Your attention is scarce. Your willingness to visit their store, to return, to make purchases, these are scarce. If you see too many substandard goods, your willingness to return to the store decreases. Some folks have argued that businesses can sell all digital goods for all time, but most experienced storefront owners would tell you this is an ineffective strategy which will reduce your overall sales. There is a balance point between offering too much and offering so little that you lose opportunities for sales.
My point is, offering too much can cost you. "No it can't," you may argue. Well that is a belief you are free to adhere to when running your own store, but is not intrinsically evil, scummy, underhanded, or "shameless" to disagree on that point. I look at the swtor cartel coin shop as a blatant example of storefront diarrhea, endless amounts of stuff offered and it all starts looking like crap to me. Honestly I think Blizzard is past this point as well, they should have reduced what they offered a long time ago.
At any rate there is a cost, it isn't free to run a digital storefront, and if your goods don't return enough value, they should be replaced with something which can. Even if it is virtually free, you are losing dollars you could be making by eating up attention bandwidth with crap few people are interested in. Opportunity cost is cost.
Letting people know you're retiring these substandard goods and offering them at a discount is win-win to both consumer and storefront. That folks are outraged by it is baffling.