Hey there, welcome to the forum…
Without the player.log debug file (in the same folder as the le_graphicsmanager.ini) I cannot be sure, but without any further info, I would guess that the game is trying to run on the iGPU in your CPU and not the 3070 Mobile GPU… If it were using the 3070 gpu, there is no chance a framerate limit of 15fps would be causing any issues. But if its trying to run on the iGPU, its very possible it will have problems.
Looking at your Dxdiag its saying your iGPU is enabled on the internal monitor but the 3070 doesnt have associated monitor details so this seems to hint that my guess may be correct.
This happens OFTEN on laptops depending on their default configuration, performance configuration (i.e. is it set on max performance) and sometimes even laptop vendor applications.
If this IS what is happening, then there are two places you can force the game to run on the 3070 - one at Windows level (Advanced Graphical Settings) and the other at the Driver level - tell the driver that the LE executable file must run on the 3070 GPU.
And obviously make 100% sure its running on max performance before launching the game.
If forcing the game to run on the specific GPU doesnt work, then please include your player.log