It never came down to rejection or acceptance. It was preliminary discussion on the subject. Russians have been pushing for sale of standard version of Su-35 to most countries interested in buying it. Pakistan wants more modern and advance avionics, predominantly AESA radar, which the Russians up until now were holding back on because of Su-57. They did not want their existing lead aircraft to compete with their future aircraft in both domestic and international markets. But as the future of Su-57 starts to look bleak aviation experts suggest transferring some of those new technologies to Su-35. The question of selling them at this stage to a foreign and a non-partner (or not-yet-partner, or budding-partner) country will however continue to persist for Russians.
BUT, the Su-35 continues to hang around in Russia-Pakistan rapprochement dialogue process. Essentially, I think the final outcome on Su-35 could depend on the upcoming PTI government. Gazprom has been patiently holding on to its billions of dollars worth investment proposal in Pakistan since the last PPP government. Even Putin was willing to visit if Pakistan agreed to commit. The PML-N government doesn't appear to have done much about it either. But the proposal has been revisited and negotiated in the last year or so & its reported value is around $10 billion. If this deal is concluded it could in theory open flood gates for much larger defence cooperation.