Razer Blade 16 with a Razer Razer Core X Chroma

I thought my laptop wouldn't need the power cord when using the X chroma? I have to have my power cord connected to the laptop as well as my thunder bolt cord to use the EGPU. Otherwise it says not enough power… 

Wasn't the X chroma supposed to supply my laptop with power through the thunderbolt cable? 

I have a blade 16 with the 240 OLED 14900 and 4070. 
X chroma has a ASUS Tuff 3070 in it. 

Thanks,