Well, pronouns sounds similar in all Slavic languages, not only Polish and Russian. Czech and Slovak, Serbian&Croatian, and in others..Only in Bulgarian they are little bit dufferent, she is "тя", he is "той", they is "те", we is "ние". I is "аз".
trust your friend (If they are trustworthy). Unfortunately TTS sometimes pronounces words wrong, especially misplaces stress. Polish as a rule has stress on second syllable from end.
(There are some exceptions - mostly for third syllable from the end. )