Unfortunately, this move by AMD can only address half of the issue.
The worst part of the pricing problems AMD are suffering with Zen 4 comes from DDR5 memory. Due to it being so new and, at this point, overly expensive almost everywhere.
This is not much an issue on the high end. If you are willing to spend thousands of dollars, it doesn't mater that much to spend a couple hundred more for DDR5 memory.
But in the mid/low end, where the Ryzen 5 and this new A620 chipset is expected to live, the difference from going DDR4 or DDR5 is, as of today, a killer, as the premium you must pay for DDR 5 can easily go instead to a beefier processor on Intel side which still support DDR4 on their latest Raptor Lake CPUs.