It cannot be it usually because "il" is considered only to be "he". As with "ils" it is a plural "they are" (can only be ils in a sentence though if it is multiple men or a group of mixed genders with atleast one man ...but that's a different disscusion) but it can also mean "it is". And in this sentence it is an "il" making it he not it
During this lesson a male person reads aloud "banane" and stresses the "e" at the end. That is, he makes it sound like the way we say it in English. A female person, in another part of the lesson, pronounces it without the stress. That is, like "banarn". I presume both are correct?
The ending -e is generally mute as you know.
But some people who enunciate very clearly add a schwa at the end of some words, most of the time if the next word starts with a conflicting consonant.
Also be aware that French people living in the south of France tend to add schwas to many words.
You can tell because it will be plural AND the word for "eat" will differ.
He eats (Mange) They eat (Mangent)
They: Plural (add "s" to the first word) ils mangent une banane = they eat a banana
He: Singular (No extra "S" to the first word) il mange une banane = they eat a banana