Yes, this looks correct for your configuration.
From the MariaDB GTID documentation:
A global transaction ID, or GTID for short, consists of three numbers
separated with dashes '-'. For example:
The first number 0 is the domain ID, which is specific for global transaction ID (more on this below). It is a 32-bit unsigned integer.
The second number is ...
First of all, this is not an error, just a "note". If it were an actual error, it would say 'error'.
The meaning of the message: An attempt at connecting from this host to one of the two other hosts in the cluster timed out - and the timeout is set to 3 seconds.
However, as per the subsequent messages, it then tried connecting again, and thankfully ...