Questions about example sentences with, and the definition and usage of "Takoyaki"

A: イカでできた有名なたこ焼きがあると聞きました。
(それが正しいと思う. Google)

A: A takoyaki means just one piece

But it’s not natural

You would say I ate a piece of takoyaki

A: I think both "this is" and "these are" are acceptable here.

"This is so tasty!" refers to the serving of takoyaki as one thing.
"These are so tasty" refers to the individual takoyaki balls as many things.

A: Octopus balls

A: We just call it Takoyaki.
But it is translated as "Octopus Dumplings"

A: Keep in mind I have an Australian accent :)

I said "takoyaki" and "okonomiyaki" like how most native English speakers would pronounce them, so they will sound a bit different from their Japanese pronunciations!

Feel free to use normal Japanese pronunciations for "takoyaki" and "okonomiyaki" though!

A: × The name of the okonomiyaki sauce is the most delicious, the one named Otafuku Sauce.
✓ The name of the okonomiyaki sauce which is the most delicious, is called Otafuku Sauce.

A: × I dip sauce and mayonnaise on top of it.
✓ I put sauce and mayonnaise on top of it.

× Takoyaki is a specialty of Osaka and is very delicious, so many people have a special takoyaki iron plate that they can make at home.
✓ Takoyaki is a specialty of Osaka and is very delicious, so many people own a special takoyaki iron plate so that they can make it at home.

Some minor corrections:

Dipping is usually when you put one object into another liquid. So if you want to use "dip" you would "dip" the takoyaki into the sauce and mayonnaise. If you want to say you put the liquid / sauce onto it, then you would say you "put sauce on it" or "cover it in sauce" or "top it with sauce".

"Sauce" is kind of vague. I think it's more common to say the name of the sauce if you have it. Mayonnaise, for example, is a kind of sauce.

The last sentence also "so" can be read as a continuation "like A, so B" or a description for the amount "There were so many of these!" so it's kind of a bit confusing to read. I recomend:

"Many people own a special takoyaki iron plate so they can make it at home" as another variation.

Alternatively: "Many people own a special iron plate so they can make takoyaki at home".

A: here’s some small corrections:

A takoyaki shop in Osaka escaped taxes for the past 3 years until two years ago, resulting in 130 million yen. Even if you are swimming in cash, you should always pay your taxes.

A:

Oh I see!

Does this sound natural?

​‎A takoyaki shop in Osaka evaded taxes for the past 3 years up until the year before last, totaling 130 million yen. Even if you are swimming in cash, you should still pay your taxes.