The Supreme Golden Immortal is indeed superior to the top Golden Immortals.
This Chi Tianyuan Golden Immortal has been part of the support squad for thirty years, having defeated hundreds of Evil God Avatars. His individual combat strength is likely on par with the teams led by the three top Golden Immortals — Gu Jinlai, Donghua, and Li Luo.
Following such a formidable figure, even if one encounters the Evil God You Lan, one could hold out until reinforcements arrive, making safety quite assured.
"Three hours... that's possible."
Gu Jinlai spoke, adding, "I must ensure the safety of the team members. The power of the three Evil Gods is too overwhelming; I need more Golden Immortal support to..."
"This is an order! Just execute it!"
Chi Tianyuan interrupted him with a wave of his hand.
"Every minute wasted results in cultivators being corrupted by the Evil Gods and some even dying in battle. There's no time to lose! Engage!"