The tunnel table is not used directly in the SRv6 locator resolution, in SID resolution, or in packet forwarding. All resolution is performed in the RTM and forwarding is performed in the FIB.
When LFA is enabled in the IS-IS instance, a remote locator or a local adjacency that has a primary next-hop or a pair of primary and backup next-hops creates as an entry in TTM (ROUTE_OWNER_SRV6_ISIS). The entries in the RTM and FIB point to the tunnel ID of this tunnel. The TTM entry is however not used directly for forwarding SRv6 packets.