Oh dear!
I would put money on what you have been sent is internal grade Cat 5e data cable!
External grade data cable, should be a minimum of LDPE-
LDPE (Black) – alternative PE sheathing material for cables used for outdoor use. LDPE material is UV stabilised, which contains around 2.5% carbon black and has excellent weathering resistance.
The LDPE fulfils the requirements of IEC 708-1 tested according to IEC 811 and BS 6234 03C, TS1 as well as others.
There are other types of external data cable with, similar characteristics as LDPE. namely MDPE, HDPE (not really used) and UTP (armoured for ducting.
External data cable it notably black but, MDPE can also be coloured with standard sheath (Orange, red, green, blue and violet)
What is annoying is there is a specific cable for supplying chargers called EV Ultra. EV Ultra is basically SWA (armoured cable), that specifically has a set of data cables within it for load curtailment. However not everyone uses it, where wireless curtailment devices are used and cheap skates!