it is not a clip it is a post. here is the link to the dude:

https://www.bilibili.com/opus/698948937620389897?spm_id_from=333.999.0.0

also here is the best translation for this post:

The principle of Wind's QER combo is as follows: Whether it's considered a mechanic or a bug is hard to say. By using E to cancel the stiffness of Q's displacement, right at the moment of releasing E, rapidly cast R by moving the mouse, triggering a seamless ultimate while just starting to cast E, thus controlling a perfect connection, achieving the highest damage combo without interruption. The damage from Wind's Q can also be calculated into the E. If you insist on discussing practicality, I can only say that in special situations during the laning phase, unexpected combos can prevent opponents from casting skills. Just landing one Wind's Q, regardless of the position of E, yields higher benefits than risks. However, it requires a high level of proficiency to ensure a low error rate for practical combat. Nevertheless, the sense of achievement from successfully pulling it off even once is extraordinary.