He's talking about Blitzortung Data to servers, and possible delays in signal .... The stroke GPS time stamps are generated by the Blitzortung controller, so that wouldn't be affected, but he may be concerned that data may arrive at the server outside the sampling time limits.
Suggest post this query on the main Blitzortung Internal forum, as I believe there are several operators who do use Satellite... I believe such potential delays are considered in the server algorithms, and I think the server's 'time slot' to 'detect' is generally about 1-2 seconds. (Before comparing all network station signal time stamps with each other) though I also believe the length of that slot varies depending on number of 'relevant good' stations signals reporting ... more 'faster' stations with 'same' sferic, shorter time required to 'locate'. Your 'delay' outside that slot would be dependent more on your provider's hardware and network than on transmission to and from satellite.