Ofc it is 1/8 in osu!, but because of strange algorithm, its 1/16 in taiko...Also, if its 1/4, 1/6 or even 1/8, why MittenMasterz and youngdow didn't FC it? I can bet that it's faster than 1/8, probably 1/16. Also, peppy knows how this algorithm work, so he should be able to judge wether it's "simple 1/4" , 1/8 or 1/16. And 1/8 is possible with 170bpm, that's why people can FC it in osu!
EDIT: I checked how this algorith works...It converts beggning and the ending of slider to a beat, and add some notes inside if its somewhat longer. So, in marisa, where there are 1/8 sliders it converts the ending to the beats as well, so there are 2x more notes = its 1/16
@Zekira: I may do it wrong, but it's still 1/16.
EDIT2: There is 193 notes in that stream divide by duration 8,47 gives about 22,75 clicks per second. 22,75*60/170=8. I guess I was wrong then and it's 1/8 stream. Anyway the question is, why people in osu! can pass it and they can't in taiko (most of them...)? Then it must be 1/4 in osu!, and probably is. Well, it is possible to FC it then, but none 100? Odd. And rokodo had to press both brums in deathstream to get only 1k less score than kanopu. So even if it is only 1/8 stream, I am pretty sure that both of them cheated