not really, no.
That build does not have ipv6 enabled, i.e. the sockets are not created as ipv6. However if your network stack is not pure ipv6 (which most aren't for compatibility reasons), then even this build works with ipv6.
See here for such hybrid stacks:
The reason for a separate build is that the ipv6 build first always tries with an ipv6 socket. Which causes a second (fallback) try with ipv4 if ipv6 fails. At least in the first builds (as mentioned before: years ago) this lead to a noticeable slowdown for every connection.
For most operations this isn't an issue, but in the repo browser where hundreds of connections can be made, this would be very noticeable.