Why is the transcendental platform called transcendental platform?

in the second year of his transfer to Zhizhou, Mizhou, Su Shi restored a broken balcony, which his brother Su Zhe named "Chaoran". Su Shi wrote this "transcendental platform" to show his thought of being detached from things and not being happy.

See also the last paragraph

The original text

It is time, and it is given to disciples by being comfortable in Jinan, and it is called "transcendental", so that those who are unwilling to be happy can swim outside things.

Translation

At this time, my younger brother Zi You happened to be an official in Jinan. When he heard about it, he wrote a poem and named this desk "Chaoqian" to explain that the reason why I am happy everywhere is probably that my heart can transcend things!