Many thanks, Shashank, for the detailed explanation. This certainly clarifies the open points I had. In summary:
- active-active HA mode affects the static routes provisioned on the transport nodes' DRs towards the T0 SRs i.e. multiple upstream next-hops.
- ECMP option affects the routing protocol and its route selection and the installation of multiple routing table entries for the same prefix in the routing table on the same edge. This would be the equivalent of BGP multipath on other vendors' equipment configured with the maximum-paths command.
