As I had just found out, the last seen for Meta and the Parent site is different. Therefore, the whole assumption my argument was based on is wrong.
I'm leaving the question so that the answer is not without context.
Nevertheless, there are multiple issues with the site (i.e. off-topic questions not being closed, the review queue being full and no mod participation whatsoever), that I am actually voting to get a new Mod election.
The number of questions that are off-topic being deleted or closed is close to zero!
On a Beta Site, the most important thing (in my humble opinion) are active users. The second most important thing are active moderators.
Currently, Health.SE has three moderators (last active numbers are all wrong):
Susan, who was last seen online yesterday. Susan is also a moderator on Biblical Hermeneutics. Her newest answer was committed on March 10, 2016 and the newest question asked on March 11, 2016.
michaelpri, currently last seen online on April 23rd, being 12 days absent from this site now. Michael is also a moderator on Lifehacks.SE. His newest answer was committed on March 4th 2016, and his newest question asked in April 2015.
John P, currently last seen online on April 20th, being 15 days absent from this site now. John is also a moderator on Fitness.SE. His newest answer was committed on March 16, 2017 and his newest question asked on March 26, 2016.
This might be just my impression, but the users I see most on Health.SE are Lucky, Carey Gregory, Pills N Pillows, Butterfly and Bones and L.B. The review queue does support my impression though, as only one moderator reviewed posts via the review queue as the fifth-to-first user.
In my opinion, it is very important that moderators stay in touch with the community, especially on Beta Sites. I can understand that the moderators have many responsibilities and always a lot going on. I also don't want to create the impression that I pick on these 3 moderators as Stackexchange Users.
However, if you, the Moderators, feel that you can not be 100% behind managing Health.SE, I would kindly request you to consider the option of stepping down.
This way it can be ensured that neither of you gets burned out as was recently the case with a few moderators on other sites (we're Health.SE and should be a good example!), and the Community also benefits. Even if no new moderators are appointed or elected, there will be a vacancy for good as everyone will give their best to find a new moderator.
Is Health.SE sick? is almost 2 years old by now, but the issues still remain unsolved.