I really wanted to know what are the "improvements" they claim.
I see they rerouted the "via" and used a black finish
What kind of soldering iron do you have?
Are the solder tips really tiny, like a pin tiny?
My soldering iron tip is quite large, may need to find something else
I use a "somewhat" tiny solder tip.
Here's a pic of it next to a regular sewing needle:
The smaller your tip is the less heat it will conduct. So, for big GND pads/planes that sucks too much heat before it can melt the solder you should either increase the temperature or leave the iron tip there for much longer.
Both can have "consequences": you could either burn the pad/via/trace or rip it off.
My advise for you is, first practice, second a good flux is your BEST friend!!!
Since I already have some experience I use the same tip for everything, increasing the temperature when I see the GND isn't melting the solder.
I should warn you though that, no matter how experienced you are, you can f*ck up sometimes. Specially when you're too "experienced" since you get "too confident" and too much confidence can lead to mistakes
For times, when increasing the temperature to solder a GND plane I forgot decreasing it and removed a tiny 0201 SMD component I should attach some wire
Take your time, don't rush things up and if you see something "isn't working" don't push it!
Cheers!