it's either rusted in place, or someone put glue in there, for some odd reason.
drip REAL penetrating oil in there (WD-40 is not a REAL penetrant oil)., around the edges, and also drip some through the drain hole on the bottom of the frame BB... re-soak it before bed time... let it set overnight.
then knock that remnant of the BB bearing assembly out...

i run into those tubes being stuck fairly often... the last stuck one was a PLASTIC tube... Rusted in place.
that stuck tube in your frame was one reason that the Cups didn't want to move easily, and is a symptom of WHY that tube is also stuck... RUST.
Sea Water does Bad things to bicycles, and other metal objects.

i find it rather odd that the bottom bracket underside pic shows a cable stop for a front derailleur, but the Trek Zeckor Zero doesn't have a front derailleur... and you should measure that BB width again, more carefully... i bet it's a 68mm width... the only treks i've seen with a 7omm width BB are special ordered ones that were specified to have Italian Campy parts installed by the ordering person...

for reference... meet the Zecktor Zero Trek bike... https://billigcykel.dk/images/Trek_Z...l-2017-2-p.jpg
another pic, and specs...https://99spokes.com/bikes/trek/2016/zektor-zero-dk