I’ve had the same question answered two different ways by two different outfits. I currently do not hold an ATP just a commercial. Time was as PIC of an aircraft which met the guidelines.

One said all my 135 time counted towards upgrade since the aircraft met the requirements. The other said that since I did not hold an ATP while obtaining that time, it will not count, even though the aircraft which I flew required a type rating (which the checkride is completed to ATP standards).

Didn’t exactly make sense to me, hours are hours after all. By that logic, it would be as if my total time obtained during my private or instrument wouldn’t count either. Some clarification on the regulation would be helpful.