"Starting April, 2020, all apps submitted to the App Store will need to be built with Xcode 11. Xcode 11 requires macOS Mojave 10.14.3 or later."
Does this impact in-house adhoc distribiutions of apps using an enterprise development licence? Will we still be able to build apps with xcode version 10 and distribute them in-house?
The impact is directed at apps destined for the store. Related checks as part of the submittal process are not going to be made unless you seek to utilize that channel.