Declan McKenna
It seems there was a mismatch or confusion in the information you provided. The name Declan McKenna (born December 24, 1998) is indeed a real public figure — but not as a sculptor. He is a well-known English singer-songwriter and musician.
On the other hand, I did find a different “Declan McKenna” who works in experimental animation / mixed media / puppet / set fabrication / stop-motion art, but not primarily known as a sculptor.
To clarify:
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Declan Benedict McKenna (born December 24, 1998) is a musician (singer, songwriter) from Enfield, England.
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A separate creative “Declan McKenna” (perhaps younger or less publicly known) is working in experimental animation and puppet fabrication (which can include sculptural / three-dimensional work).
Which “declan mckenna” do you mean? The musician (the well-known singer) or this visual / animation artist? Once you confirm, I can write a full “author biography” accordingly.