3 points:
As you know, inflation has been rampant in the last 5 years. Also LHe price has gone up on top of that so it really wouldn't surprise me if the price as doubled since then.
Even if we take the price as 5,000$ / 100L, that is still 100 time more than I pay per liter of LN2. Not only that, the amount of benching you can do per liter of LN2 is more than per liter of LHe.
You point about GPUs is a silly one because they are reuseable and resellable, sometimes even for a profit during a crypto boom. LHe literally turns into thin air.