FYI, Drake responded to that thread over on the steam forums:
"Originally posted by Drake:
v219 ARK Dev Kit will be updated this weekend. Please bear in mind that we prefer to stabilize the major versions before we release the Dev Kit, to be sure we have no bugs with the core game as it is very time consuming to generate and upload the Dev Kit versions (the source content files are quite large). For now, there will be an approximate 5 day lag between Major Version updates and the Dev Kit. This may get reduced as we expand the support team, but for now, it’s the nature of the current tiny team.
Thank you for your patience, and yes I know it’s not ideal, not yet at least 
Best regards,
Drake"
At least it’s something!