Hello Robin,
If you're not sure exactly what Alexander's reply means, the best place to ask would be in that same support ticket that you already have open.
However, to answer your concern - it simply means he changed the PHP version that your account was running on temporarily while the issue was corrected. This allowed your websites to be online and active even while he was still working.
Additionally, Alexander has confirmed in the ticket that the issue was corrected and everything is functional at this time.
We appreciate your patience in this matter and apologize for the inconvenience.