Questions about the Arabic language and/or pronunciation are off topic: Should we allow questions regarding the Arabic language?
The accepted answer of your linked post says:
Tajwid is a uniquely Islamic science, more connected with recitation of the Qur'an than to Arabic itself (nothing other than Qur'an is spoken/recited with Tajwid). It is an integral part of the field of recitation and Qur'anic studies, and therefore questions about Tajwid should be squarely on-topic on Islam.SE .
This shows that tajweed of qur'an and Arabic pronounciation don't fully match and can't be synonyms.