I have checked the AP details and the AP7050de is supposed to support SAC and allso deleivers SAC statistics when I enable sac on the VAP profile and add a AP7050de to the group.
<Ikarus>dis ap all
Total AP information:
nor : normal [4]
ExtraInfo : Extra information
P : insufficient power supply
-------------------------------------------------------------------------------------------------------------------------
ID MAC Name Group IP Type State STA Uptime ExtraInfo
-------------------------------------------------------------------------------------------------------------------------
0 18de-d778-4760 6050dn-Monitor Mashnet-Monitor 192.168.201.132 AP6050DN nor 0 1D:1H:29M:7S -
4001 cc05-7753-a0e0 7060dn-bg Mashnet 192.168.201.131 AP7060DN nor 7 1D:15H:17M:26S P
4002 cc05-7753-a060 7060dn-2e Mashnet 192.168.201.134 AP7060DN nor 5 1D:15H:16M:40S P
5000 340a-9835-dcc0 7050de-test Mashnet 192.168.201.129 AP7050DE nor 1 9M:23S -
-------------------------------------------------------------------------------------------------------------------------
Total: 4
<Ikarus>dis sac protocol-statistic total all top-n 10 ap-id 5000 radio-id 0 ssid mashnet
--------------------------------------------------------------------------------
Protocol Direction Packets Bytes
--------------------------------------------------------------------------------
snapchat Inbound 9,595 689,221
Outbound 14,333 17,088,348
quic Inbound 556 225,596
Outbound 515 398,058
https Inbound 209 47,659
Outbound 239 105,013
appleicloud Inbound 82 12,843
Outbound 82 44,824
mdns Inbound 4 560
Outbound 154 18,655
apple_service Inbound 29 2,761
Outbound 29 13,240
dns Inbound 1 75
Outbound 48 6,471
general_tcp Inbound 25 1,300
Outbound 0 0
netbios_name_service Inbound 0 0
Outbound 12 936
igmp Inbound 8 368
Outbound 4 168
--------------------------------------------------------------------------------
<Ikarus>
I will run AP7060DN without sac for now but I guess it would be good to ask R&D about this behaviour.