It's mean your line has been resync 6 times!
It is a reason code, not a count, so it does not mean 6 times.
I probably get mix up with this one below:
DSLAM type / SW version: BDCM:0xa4aa (164.170) / v0xa4aa
Modem/router firmware: AnnexA version - A2pv6F039g1.d24m
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 1 day 3 hours 7 min 27 sec
Resyncs: 0 (since 9 May 2025 17:18:40)
and this one below:
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 0
Last initialization procedure status: 0