According to https://issues.chromium.org/issues/361717594, the option "Save all as HAR with content" is redundant, as the option has been available for some time in the Download icon under the F12 Networks tab.

Image of the download icon of the F12 Networks tab

I've confirmed that this option does include response content also.

While I don't agree with the Chromium developers' opinion on redundancy as many people including myself used the Save all as HAR with content option, I'm glad to know this is still available albeit in a different place.