Disable Defender but keep Windows Firewall active in Win10

In the latest Windows update (1803) it seems that the Windows Firewall is now part of Windows Defender.

Windows Defender is questionable and MsMpEng.exe continuously eats resources - I disabled Defender using the Local Group Policy (https://www.windowscentral.com/how-permanently-disable-windows-defender-windows-10).

However, I think that now the Windows Firewall is also disabled.

Is there a way to keep the Windows Firewall active but get rid of the Defender (again)?