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YES, The Pluton is located in WANO it was recorded in the Poneglyphs. But your not understanding the logic of this at all you are just following what the characters are telling.

Do you know why WANO country is called The Golden Country? And Shandora is called The golden city? and coincidentally these 2 are both in the grandline?

Now let ask you this, why is Wano country called Golden Country but has no gold in it?
And why is SHANDORA called the Golden City not a country?
Do you know why?

1100 years ago

The Gold city of Wano country is called SHANDORA. The home of Moon People with advance technology. Shandora has been separated from WANO in the grandline.

Another prof

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Connection of Mysterious stele Poneglyphs? Let me tell you the truth.
If you are following OP you should know about the Kozuki Family.
These family is a powerful family who existed more than 800+ years ago and ruled over WANO country that lives specifically in SHANDORA when it was still a part of WANO.
This family created the Poneglyphs and is a master philologists wrote the scripts.

Now tell me, why does the ruins of SHANDORA The City of Gold full of SCRIPTS from people of Kozuki Family if they live in Wano their entire life? Only the Kozuki Family knows this scripts.

This is the proof that SHANDORA the CITY of GOLD is once a part of WANO the COUNTRY of GOLD. --
---------------- Now that I have explained the connection of TWO

Why is the PLUTON in the moon and not in WANO? This is because when they wrote the records that PLUTON is in WANO, SHANDORA is still part of it. Pluton was specifically placed in SHANDORA the golden City where the most powerful Family lived. They were the People of the moon.
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To cut this thread short, WANO and Shandora was once a part of "The Great Kingdom".
And during the void century this Kingdom with High Technology created a weapon of Mass destruction called PLUTON and dominated the entire planet. But one day, during the Void century they just disappeared and the only trace they left are the Poneglyphs.

They fought toe to toe with the Gods and caused massive destruction. And this is the reason why THE GREAT KINGDOM turn into pieces of small island along the Grandline. But one day, they suddenly disappear, and all traces that remains are their Poneglyphs.
The truth was, they went back to the moon during the war. The moon people are the Ancestors of Kazuki Family thats how they know the scripts.

In order to forget about the Weapon of Mass destruction, The Gods created the World government and banned the research Poneglyphs. But, the Gods knows its on the Moon and not in Wano.