Take it holistically. What happened to mid lane in 6.85? The uber int carries were nerfed to the ground, only QoP remains, and that and the buffs gave Alch enough room to shine.
And yeah streams and memes.
Jokes aside the solo mid radiance rush Alch is really good in (my 4K MMR) pubs
My fastest timing so far is an 8 min Radi
Thats an insane amount of damage output at 10 mins