1. We have not yet as we do not have a contact there and also lack a Chinese translator. We would love to partner with them in some way if they have an interest in it and would be happy to work something out if they have the 1.18.1 source code. That is a very large if that our team is not yet convinced of, if they develop and repair their server from it's current state then we would be much more interested in putting in the effort of getting a line of communication open with them though!
2. Yes
3. Yes
4. As unstable as it will ever be. Every day that passes our team is chopping away at years of technical debt. Not to go into too many details, but one thing much of our team has an absurd amount of experience with is cleaning up tech debt and working with 20+ year old software projects to modernize them. As far as guarantees there isn't much we can offer you beyond our word and the knowledge that if the project goes under for any reason, the Knowledge Keepers will disseminate the code/database snapshots for all to see.