those tracks are HUGE right there. its probably a temperature dissipation thing. Get a fatter desoldering tip on there and up the temperature. If new solder does not flow nicely then its not hot enough to vac desolder.
I will dual wield at times to get stuff like this desoldered. Use the pen iron and the desolder gun in both hands after adding more fresh solder to get it hot enough the solder liquidizes and you can suck it off.