Why can't I confirm combined ports LAG speeds on XG1250-12 switch?

I'm trying to connect on LAG from my 1250 to a older netgear GS116e v2 managed 1Gigabit switch which has static LAG link aggregation only, like this:

Asus RT-AX58U Router--------------Netgear GS116Ev2========Zyxel XG1250-12
 However when I attach the 1250 having created LAG Group 2  via 2 cat 6 patch cables, BEFORE connecting the cables to be on the safe side, "System, Per Port Status reads only LAG2 1Gbps not 2Gbps as I would expect!
Also Groups to clients NAS & PC in group 3, [2 x  1Gbe] & group 4 [2 x 2.5Gbe] LAG's show the same Status report, only the speed of 1 port  and not the combined LAG speeds of the two ports combined.

Is this the Web and hardware LED's limitation of not having a option for 2Gbps & 5Gbps speeds or is a limitation of the Zyxel 1250-12 switch use of LAG static aggregation?
If for instance I upgraded to the 1930-10 class switch's with their LACP, bearing in mind I would still b using the Netgear GS116ev2 in the topology, would the Web management browser page or windows sw app and/or hw LED's show the right speeds of 2Gbps & 5Gbps?

Even though I'm sure the NAS & PC are correctly LAG linked as the PC has increased its status speeds in windows properties from 2Gbps to 5Gbps now that the Zyxel web gui reporting differently how or do I need to check with some 3rd party sw?

Finally if I upgrade from the non LACP/LAG Asus RT-AX58U to a  LACP/LAG version will the 1250 accept a  LACP/LAG link giving me 2Gbps from it like?:

Asus RT-AX88U LACP Router=======Netgear GS116Ev2========Zyxel XG1250-12

Sorry for long question but I need to make a decision on the switch as to whether I need the 1930-10 class unit for LACP on switch and router LAG bandwidth please.