Check your live logging and make sure the driver is successfully posting to the db. Are there any errors coming from the driver?
I use a separate DB for the Live Logging.
Is your influxDB a V1 or V2 version. What is it using for the query language.
No. As I mentioned, I confirmed that the log data is making it into influxdb and does in fact make its way into Grafana. I can write a simple query to see the log entries.

It's not clear to me how your dashboard panels query for data. If I click Edit in the syslog count panel, I get the following: It indicates that there are 7 queries but they're all blank.
The dashboard json is in your original post from April 2023. Could it be that something in Grafana has changed since then, and that json is no longer valid?