Why Contemporary Manusmriti isn't a reliable Hindu scripture?

Namaskaar 

The ashudh ManuSmriti scripture is contradictory to the highest Vedas and show individual contradictory ideas such as the statement saying that eating meat isnt allowed contradicts a lot of verses in the same manusmriti. This shows how this scripture has been changed and therefore not reliable and not considered a Hindu scripture. 

Verse (5:30) and (5:41) in the ManuSmriti say eating meat is allowed and not sinful even going onto advocate eating animals which go against the Veda's and it's own internal contents as seen in Verse (3:82) of the ManuSmriti (Any scripture that go against the veda's are rejected as Hindu scriptures as the Vedas are the roots of all Hindu scriptures) In the Rig Veda, the verse (10:87:16) shows that eating meat is a sin and the ashudh ManuSm sriti saying that eating is not sinful is the prime example of how the present day ManuSmriti is ashudh and not a reliable scripture as well as not recognized as a Hindu scripture to take information from and implement into ones life 

It has been altered as we see that the present version of the ManuSmriti is only about 500 years old which shows how it's been manipulated. In a nutshell, the present version of Manusmriti is ashudh (impure, manipulated) and not the original one which was written by our great rishis/sages in the Vedic period. Therefore, not to be taken as a literal source of knowledge or factual scripture in Hinduism