At least this one is getting built, similar to the Brenner Base Tunnel in the South - the common thing tying both projects together is Deutsche Bahn, the federal parliament and the local parliaments being unable to get their asses together and expand the regional tracks to be able to carry the extended traffic that both these tunnels enable.
But is Germany even deeply involved there? I thought construction was split between AT and IT.
The BBT itself, no that's indeed (thank God) not handled by DB.
But the BBT also needs supporting infrastructure from Kufstein to Munich, the so called Brenner Nordzulauf [1], some of which (the Truderinger Spange) is also covered by the Ausbaustrecke 38 programme [2]. Unfortunately, the Brenner Nordzulauf has been hotly contested [3] with very good points being raised - among others, some of the route proposals run through nature protection reservates, people are skeptical of years worth of construction, noise, debris, rail and road blocks, and separation of entire areas by another rail track.
[1] https://de.wikipedia.org/wiki/Brenner-Nordzulauf
[2] https://www.bahnausbau-muenchen.de/projekt.html?PID=29
[3] https://www.sueddeutsche.de/muenchen/ebersberg/brenner-basis...