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0 if what you name "isha time" is not really isha time start, then it is possible in high latitudes of earth in some time in summer side of year. "isha" time is given in prayer tables for that places but it is not really isha time start as it means for normal places.
Those prayer tables use 18° for Fajr, it is recommend to wait 10 to 20 minutes before starting Fajr salaat. Equally, complete sahur (imsak) (pre-dawn meal) 10 to 20 minutes Fajr time when using 15° table. And now finally, to answer your question, no where in the article did the mention of angle less than 9° come up.
Fast is a worship we do for Allah and nobody would like to risk doing it badly or starting it badly, that's why many people keep a safe time zone between adhan and the time tables (as time tables may have an inaccuracy of a few minutes +/-) You may also refer to the chapter on the prayer times in al-Muwatta' for more information.