They say: "Regarding Phrack’s claim on contacting our legal team 8 times: this is not true. We have only received two emails to our legal team inbox, last one on Sep 6 with a 48-hour deadline. This is unrealistic for a company the size of Proton, especially since the message was sent to our legal team inbox on a Saturday, rather than through the proper customer support channels."
According to Proton's response in the linked reddit post: https://news.ycombinator.com/item?id=45227356
They say: "Regarding Phrack’s claim on contacting our legal team 8 times: this is not true. We have only received two emails to our legal team inbox, last one on Sep 6 with a 48-hour deadline. This is unrealistic for a company the size of Proton, especially since the message was sent to our legal team inbox on a Saturday, rather than through the proper customer support channels."