Those chinese boxes such as the viarks/Qviart Dual do use stream relay which is why there is a short period before the channel clears.
To be fair to people on here i have recenty downloaded a very well-known channel list and within that list, there are many sky it steam relay channels for HD. I have not tested them on my qviart dual on E2 as i don't think i have access. DE i know works and i know uk i have no access. If i want access i just reboot into android and use the forever server.