In its official website, it claims that the TV mount can hold for a max. of 45kg, I think 45 kg is already a reserved value, its build is quite rigid, I do think even exceed 45 kg, if not too much, say no more than 50kg, the mount is still ok ! And now your TV is only 42.5kg, which is within its claimed 45kg max. I am sure the mount is ok for your 65" TV !
Dunno what's the brand and model of your TV, I did try input a 65" Pana TV in its website, its recommended TV mounts included EFW6435 and EFW6445, so shouldn't be any problem for your 65" TV.