To be clearer, the computerised voice seems to have trouble with the sound of ть, де and лю, and it does things like sometimes pronounce это as eto rather than eta like the great majority of Russians, and it doesn’t really make it clear that what is written as an o is usually pronounced like an a unless it’s stressed. It also doesn’t make it clear that it’s often important to pronounce the difference between sounds like т and ть - like матъ is mother, and мат is swearing.
Also doesn’t tell you that words like это (that/this/it) and я (I) are actually pronouns rather than verbs, and it’s normal to leave out the verb is in Russian in the present tense. (The actual words for I am, you are, etc are есмь, еси́, есть but they rarely get used).