I didn't get any audio for this sentence. Maybe they are changing it, but I doubt it.
So, this comment is based on a bit of guessing. ;)
From the few sentences that had audio, I can tell you that the speaker pronounces many short vowels long and some long vowels short. Maybe the stress was incorrect too as it directly depends on the correct length of the a in Stephanus.
Those were likely mistakes that would be quite major. There may have been some smaller mistakes too.
Quite wrong. They never wrote it as Stefanus in Classical Latin, because it was not pronounced with a /f/. The Latin alphabet was used to write phonetically, and since the name was borrowed from the Ancient Greek, it was pronounced with an aspirated P - /ˈste.pʰa.nus/. The Romans used ⟨PH⟩ to reflect the pronunciation Ancient Greek Φ. If the audio sounds like it's using a /f/ sound, it's wrong and you should report it. The spelling is Stephanus and none other (compare to how bizarre it would be if you were to spell Peter (aspirated P) as "Feter").
If there are multiple possible answers..
Stephanus studies and writes (estudia y escribe) Stephanus studies and is writing (estudia y está escribiendo) Stephanus is studying and writes (está estudiando y escribe) Stephanus is studying and writing (está estudiando y escribiendo)
So, there is no way to know exactly what you are being told ?