Nope. The theory that the Punjabisation of British Indian Army & Martial Race Theory were crafted by the British as a response to Punjabi support for them in the 1857 mutiny may be popularized in Indian nationalist circles, but has been debunked quite thoroughly. https://twitter.com/KesariDhwaj/status/1343991054115074054

Yes, the British recruited troops from Punjab to quell the mutiny - what is omitted is that Punjab was only annexed 9 years prior. During that 9 years, Hindustani (read: Poorbia + Ranghar) sepoys were stationed in Punjab (given extra allowances too).

Recruiting to Punjabis (and in particular, Sikhs) into the main army was officially banned by the British until 1851 - and even after that, caps were enforced (and unofficially followed) because of fear of the only recently defeated Khalsa uprising among the corps.

Thousands of former soldiers had been displaced after the disbandment of the Khalsa Army, and were unable to join for 9 years because of British policies restricting them from joining - which is why many happily took the call in 1857 when the British raised Punjabi regiments.

But even after the Mutiny in the commissions that followed, the British conclusion was not that Punjabis (and Sikhs) could be relied upon as a “loyal” force - Sir George Clerk, among others, stated that Sikhs could not be trusted because of their still-recent defeat.

The main result of the Mutiny was that the British decided that neither Punjabis (as in 1849) nor Hindustanis (as in 1857) could be relied upon fully - so Punjabis were added as a counterweight. Their numbers were still restricted so as to prevent a “Punjabification” of the army.

The Punjabification of the British Indian Army started much after in 1885 - when martial race theory was first coined alongside British paranoia of a Russian invasion into Northwest India & the [erroneous] belief that Punjabis could fight in mountainous borders more effectively.