Yes, this is what I think. They don’t care when you submitted your application. What they care about is when your background check is expiring (if the rest is fine). That’s why the later applicants are moving faster than the 2019 ones. Our second (the first one expired when they were relaxing at home) BG check was run in 2021 what brings its expiry date to 2022, what eventually makes our applications of low priority in terms of oath invitation…
My notes say that my paper file was transferred to the online ceremony room in July 2021 and was not touched ever since. A lot of other applicants receive oath invitation in a short while after DM. You think they are slowing down my file on purpose? No, my BG check is expiring April 2022, that’s why…