The classification in generations is not that easy, because while the design can be 4th. gen, the avionics of the early blocks/batches/tranches can be older gen. F16 for example is a generall 4. gen design, but the early block 15 that PAF has, are not capable of using guided weapons, or had latest avionics. These capabilities came only with Block 20 onwards and will be available for PAF with the MLU.
LCA could be seen similar, while the high content of composite and RCS materials puts the design more to 4+, or 4.5 gen, LCA MK1 will clearly be only a 4. gen fighter!
It uses multi mode radars, not long range PESA, or AESA radars. Has not advanced avionics, or techs like IRST, TVC, or SC that would and by far no stealth features.
LCA MK2 instead will have AESA for sure, TVC, or SC are possible because of new engines and good t/w ratio. IRST will be added for sure too and all this will improve the capabilities dramatically.
LCA MK1 will be at the same gen as our upgraded Mirage 2000 and Mig 29, while LCA MK2 will be at MMRCA level (technologically, not in performance of course).