A negative source does not prove you right. I hope you know the difference. In simple terms I will (for the sake of args) accept that in Punjab it was not rigid. But quote me that while Punjab was flexible, rest of Bharatvarsha was not.
There are many falsehoods in your post. I would be tired to prove you wrong. But a couple of glaring ones -
1. Rig Veda composed in Punjab only - You may be close to a great discovery. You are wasting your talent. If you know that it was done only in 'Punjab', you should submit a few journals.
2. 'The Prusha Sukta (Hymn of Man) in Rigveda says: “The Brahmana was his (Purusha’s) mouth; the Rajanya was made out of both his arms. His thighs turned into the Vaishya; from his feet was produced the Shudra”.' - This does not prove anything. To make a point - try living without any of the above and you will know how important
each of them are. Besides this has no relation to the context.
3. ' religion of the ancient Punjabi was declared Nastadharama (destroyed religion)' - No source.
4. A newspaper article is not countersigned by historians around the world. It is news. It is written by Mustaq Soofi - and NOT accepted by the world community. His views are as invaluable as yours or mine.