Satans offer to Yeshua was real. The thought of Yeshua, YHVH in the the flesh, prostrate, worshipping at his feet, is his dream Satan is the ultimate Megalomanianmc. Yeshua told Satan to get lost using YHVH's word. He knew something Satan didn't. He was going to die and liberate anyone who believes in Him in His death, YHVH and His son already had a plan to bring people, true believers, into YHVH's family, one that didn't involve worshipping satan.

John 3:16
16 For God so loved the world that he gave his one & only Son, that whoever believes in him shall not perish but have eternal life.

Isaiah 14:13-15
13 You said in your heart, “I will ascend to the heavens; I will raise my throne above the stars of God; I will sit enthroned on the mount of assembly, on the utmost heights of Mount Zaphon. 14 I will ascend above the tops of the clouds; I will make myself like the Most High.”
15 But you are brought down to the realm of the dead, to the depths of the pit.