Please read https://wiki.libreelec.tv/hardware/amlogic#install2internal .. in short, that script isn't usable now.
I'm working on an approach for user-driven tweaking of the speeds that the mmc controller runs the SD card at. There are silicon bugs in the Amlogic controller that cause stability issues at higher speeds so most boards are currently and deliberatly underclocked to use a safe "runs everywhere" 50MHz speed. Most (but not all) boards will support this being raised to 100MHz with UHS modes enabled, and some might even tolerate 150MHz, but i'm confident none will reliably run at the 200MHz rate used in the vendor kernel. Amlogic implemented some hacky and unsafe workarounds for the vendor kernel to run that fast; and those changes would never be accepted into the usptream kernel.
That would be great! Will sit tight for now, thanks.