Using level shifter based on 74HCT08

Dear fellows

Let me ask you please about using the level shifter based on 74HCT08.
It is related for the scenario when WS2812b is connected via a level shifter because a data pin of the LED required 5V meanwhile GPIO of RPi gives 3.3V only...

[INDENT]https://hyperion-project.org/wiki/Supported-hardware
WS281X-PWM: Used to directly connect WS2812b[/INDENT]

It works for me, perfectly. I just want to understand why we need to cascade two ports.
For me it looks like one port is enough for the job. Any hint would be much appreciated.

Just a feedback from my side:
maybe we'd better correct the description on this wiki page to reflect this idea?

[INDENT]Therefore, we decided to insert a line buffer between the GPIO and the led string based on a simple 74HCT series IC (using cascaded NAND (74HCT00), OR (74HCT32), or AND (74HCT08) ports)[/INDENT]

I would put in in a way:

[INDENT]Therefore, we decided to insert a line buffer between the GPIO and the led string based on a simple 74HCT series IC (using NAND (74HCT00), OR (74HCT32), or two cascaded AND (74HCT08) ports)

... Our board relies on NAND version of 74HCT so two cascaded ports are used...[/INDENT]