Just some speculation about the update, since Anova isn't putting out a ton of information. I saw in a repository reverse engineering the Anova Oven app that Anova is using Google Cloud IoT Core for communication with the oven. Google being Google, they decided eleven months ago that they'll kill the service and provided no help to any of the vendors in migrating to an alternative service [1]. The service will be shutdown on August 16, which makes the August 15th update deadline Anova published start to make more sense.
As an aside, I actually ran the update yesterday on my oven and it bricked it. When plugged in, the speaker lets out a popping noise and segments of the display blink at random intervals. I have a hunch the update may have been a bit rushed.
Footnotes
[1] As an interesting side note, Google Cloud IoT Core was actually created to replace another Google service, Android Things, which they killed three years ago.