This is well-known, the Jade Emperor and Tathagata are also superficially cordial yet internally at odds, clearly understanding that in the end, the two of them are bound to clash. The World Honored One's Heart Sutra created by Lu Ren, they have also seen, and with their ability to alter their own constitution at will, they are entirely capable of cultivating the World Honored One's Heart Sutra.
But to cultivate the World Honored One's Heart Sutra, one must first disperse their skill and start anew, which Lu Ren does not mind.
To be honest, when establishing these countless Tuo'e Temples, it was already foreseen that the World Honored One's Heart Sutra would be revealed, but Lu Ren had no notion of keeping scriptures and cultivation methods secret.
