Alexandre,
In that interview with the Haida man, there is no suggestion that the smallpox blankets were distributed deliberately, only that the disease was transmitted through them. However, in the 1970s, when I lived in British Columbia, I had some good friends who were senior members of the Haida heirachy, and they told me that they had evidence that the Hudson's Bay Company deliberately distributed blankets infected with Smallpox among the Haida, which resulted in the population of the Queen Charlottes being reduced from over 100,000 to less than 5,000 in a very short period. My friends would not show me the documentation, which they said they had come across when doing Land Claims research, but they were very principled people, and so I believed that it did exist. Two years ago, I was working on a project near Winnipeg, Manitoba, and visited the Hudson's Bay Company archives there, but could not find any documentation about this. There is no doubt that Smallpox was a major contributor to the decimation of the Indian population in British Columbia, but whether its spread was deliberate will remain a matter of conjecture until the documentation is produced.
Another piece of Haida oral history that I was told is that there were two prehistoric (meaning prior to the 1770s) shipwrecks at the northern end of the islands. The first resulted from the Haida luring the crew ashore and then massacring them, the story of the second was rather vague. About ten years ago, a friend of mine told me that two men from the BC Mainland had found a bronze cannon on the northern island, in the region of Langara Island. He said that the men had showed him a rubbing of the date and what was clearly the Spanish coat of arms, and I had no reason to doubt his story. He even gave me the names of the two men, but when I contacted them, they denied the story (of course). Either the cannon did not exist, or they intended to find a black market buyer for it, and perhaps go back and look for more artifacts. I suspect the latter, as I have reason to believe that such a market does exist.
My thought at the time was that if the cannon did exist, it might have come off the Manila galleon San Antonio, which went missing in 1604. Spain started to arm the Manila Galleons after Cavendish captured the unarmed Santa Ana in 1587. However, it is another of those intriguing stories that lead nowhere without enough evidence to justify the cost of further effort. That part of the coast is pretty inhospitable most of the time. Very little archaeological work has been carried out on the Charlottes, and there is no evidence that I know of to support the story of these early wrecks.
Mariner