During the beta for sure not, since with the new Catalina OS would be impossible (I don't even have a mac anymore myself, so on every single update I should ask someone else). Once the beta is done I'll think about it but unfortunately it's unlikely I'll have Mac support again in future games after their crazy new requirements. It's rather simple to install Windows or Linux alongside MacOS though (you can dual boot).
I was hoping that there was some solution/workaround like already happened in the past with Gatekeeper (when 99% of user simply ignored it otherwise no software would work again) but so far I haven't heard about anything.
However: if you have a previous version of MacOS, the mac app is actually inside the bundle so you should be able to run it unzipping the .zip file. Basically download the .zip file, extract it, and you should find a Planet Stronghold 2.app with an icon that should work (unless you have Catalina).
Sorry about the inconvenience :(