TPS3890：TPS389001DSER: how to calculate tPD(f)

Tool/software:

Hi team, 

I would like to check that how to calculate tPD(f) of TPS389001DSER? 

In datasheet only show the normal value of tPD(f) under CT=open, and VDD=3.3V or 5.5V. How about the situation when CT is not open and with a specified valued cap?

And I found tow related E2E link,

below one told the tPD(f) is fixed and not related to the CT cap, 

 https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/906245/tps3890-is-tpd-f-adjustable?tisearch=e2e-sitesearch&keymatch=TPS3890%25252520tpd# 

But another link shown below told the calculation formula and tPD(r) = tPD(f)

https://e2echina.ti.com/support/machine-translation/mt-power-management/f/mt-power-management-forum/273627/tps3890-tps3890---tpd-r 

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/823475/tps3890-explain-tpd-f?tisearch=e2e-sitesearch&keymatch=TPS3890%252525252520tpd%252525252528f%252525252529# 

Please help to review the question and provide an explanation.