He is a Hindu Nationalist from India. He is also vegetarian, which I know from a previous post of his, and most likely belongs to a caste which prohibits eating meat. This sort of bullshit towards Halal or even eating meat is quite common in those circles in India especially in the north. Ignore him.
Moving on....
In India most people go to a butcher shop which doubles as a slaughterhouse to buy chicken. We go there, and choose the live chicken that is to be slaughtered and then the butcher slits the neck in front of you.
As someone who has actually stood by and WATCHED halal slaughter in person, because I used to buy meat from a Muslim butcher in India, for many years, no, the neck is not slit "very slowly". It is slit fast, with one deep stroke, with a very sharp blade and I have literally seen the chicken go still after about 5 seconds, and likely about 15 seconds for goat.
I have also seen slow and incomplete slicing of the neck in most slaughterhouses owned by non-Muslims where they haphazardly slice the neck and throw the chicken into a bucket and the chicken thrashes around for a good minute before dying.
Everytime a Muslim has slaughtered using halal methods, in my long experience of buying meat in India, the slaughter has been fast, and the meat after is cleaner without any blood. Not the case with non-halal methods.
As for Sikhs - observant Sikhs cannot eat ritually slaughtered meat, such as Halal and Kosher. For Sikhs, they use a method called "Jhatka". Which is to sever the neck in one stroke - aka behead the animal. So in Sikh butcher shops, they will hold the chicken down and chop off the neck and then throw it into a bucket to bleed out.
As for humane methods of slaughter, the slaughter itself is less important than how the animal is treated before. Herding the animal into a stall, using cattle prods etc, and then shooting it in the head with captive bolt pistol or electric stunning etc, severely stresses out the animal. So there is not a lot of humanity there anyway.
Lastly none of this has anything to do with secularism. Secularism is keeping religion out of the government. Not out of KFC.
The few outraged Karens on here need to grow up and stop the racism and Islamophobia cloaked as - "I wanna know what I am eating" BS.