Apparently you have misunderstood me. I know how to distinguish letters by means of a dot. I never, for instance, have any problem distinguishing between i and ı in Duolingo Turkish, but those letters are much, much larger. Here, moreover, the R carries a hollow dot to indicate it is not followed by a vowel, but to distinguish a hollow from a filled dot is impossible for me with letters this small, even while wearing reading glasses. It is unfortunate that the font chosen is so very very tiny.
At the end of the word Gurfa the last letter has those 2 dots on top that last letter with the 2 dots on top is a letter T . In the middle of a sentence you'd make the T sound BUT if that letter with the 2 dots on top ( T sound) was the very last letter of a sentence then it gets turned into a "h" sound. I'm not an arab speaker but I know this stuff.