It is wrong to change the tag of pullquotes. There are many Sample Templates provided by Telegram staffs and none of them used this kind of way to show the pullquote citation. actually they use totally different approach. please see this Sample Template:
I think not, <cite> tag is fully supported in pull-quotes and it's correct to use it like that.
Declined by admin
Type of issue
Author added their own content
Reported
Feb 15, 2019
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https://instantview.telegram.org/samples/medium.com/?url=https%3A%2F%2Fmedium.com%2F%40ev%2Fwelcome-to-medium-9e53ca408c48