Wow, I agree. But there it is.Hydrostatic paradox - Simple English Wikipedia, the ...

But it still doesn't make sense.

i understand the explanation.
it just doesn’t make sense.
does the scale make a difference?

There's something that's not right. The scale should measure the weight. m*ga and his scales don't appear to be doing that. If you weigh the two individually you'll get corrected. I think maybe a poor explanation of the paradox. At best.

scales don't measure pressure

100g of water should weigh 100g regardless of the container.
force from a column of water is different.
not sure how a pan balance would react

that is correct