He apparently set up his youtube account to post a video of him reading it in 2 days. the account will probably get banned, but I wonder if he had other accounts set up, or on other streaming sites
there's no proof the youtube account is him it's most likely fake given you can change your @ on youtube and the channel description is just a copy paste of his twitter bio
My theory is that he is just really smart (Ivy league/private school education) and set up a hard/alt-right social media presence years in advance while planning this hero mission so when/if he got caught the right would be blamed for the act/radicalization.