As I said, there are no BLA members or Balochis in India simply because they will have extra scrutiny since they are Pakistanis. It's like saying why Canada didn't declare BLA as terrorists, or China for that matter. We declaring them terrorists is inconsequential.
Besides, why haven't you declared ULFA or Maoists as terrorists in Pakistan? They are much older than TTP. Simply because it's irrelevant.
What you refer to as "irrelevant", some would refer to as "problematic" at the very least. From The Hindu:
"Aslam Baloch, a key military commander of the organisation, had travelled to India in 2018 and underwent treatment for kidney ailments. He spoke to the media during his stay at Delhi's Lajpat Nagar with an assumed identity of ‘Qazi’.
What made his presence in India problematic was that the BLA is considered a terror outfit in Pakistan" .
If it's problematic to harbour a Pakistan-declared terrorist, logically, it is also problematic to harbour or support or facilitate a USA/UK declared terrorist. I'm surprised that you think it's irrelevant.
The below statement from the BLA is 4 years old but relevant to a discussion wherein Indian citizens feel it not necessary to declare this individual a terrorist, even though proper mature and functional secular democracies like UK and USA have done so.
Pakistan: BLF chief Baloch says Indian help 'welcome'
Allah Nazar Baloch warns of more attacks on Chinese economic project in Pakistan in first video interview in five years.
by
Asad Hashim
30 Sept 2016
Baloch is the only leader of a large group waging a war from inside Balochistan [Reuters]
Islamabad, Pakistan - The elusive leader of a major armed group fighting for independence in Pakistan's Balochistan has said he would welcome cash and other help from India.
In his first video interview in five years, Allah Nazar Baloch, head of the Balochistan Liberation Front (BLF), also pledged further attacks on a Chinese economic corridor, parts of which run through the resource-rich province.
The planned $46bn trade route is expected to link western China with Pakistan's Arabian Sea via a network of roads, railways and energy pipelines.
"We not only wish India should support the Baloch national struggle diplomatically and financially, but the whole world," said Baloch, a doctor turned rebel fighter believed to be about 50, in filmed responses to questions sent by Reuters news agency."