Yes it looks like there is some differences between area in world. Example Siglent HQ side for China there datasheet do not display this 1202CNL+ at all. Also in Europe, least I have never meet SDS1202CNL+ 2GSa/s
SDS1000CNL+ series FW is in Siglent Europe side and just as @tautech told. Also it is from 2015.
But when look this .ADS file name there is not this + (if compare to CML+ FW .ADS file name there is + for + models for separate from OLD CML without +)
But also in these older times informations about FW versions was somehow more messed up than today models... so it well possible this is just ok.
If use this now available:
"
SDS1000CNL+ Series Digital Storage Oscilloscopes (Discontinued)
Firmware
SDS1000CNL Firmware - 5.01.02.32 (Release Date 07.09.15 )
"
Perhaps it is ok, but if this is my own case... I will wait more info. (There is now several days holidays in China so can not ask from HQ)