i say yes and no more really no,

He only protected harry becuase he felt that he needed to pay back James for saving his life, however wording you put it, he did end up saving his harrys life a couple times in the dark.

but if we look at the little details he was obsessed with Lily to the point of being a double agent, and that i would not consider love. she loved someone else, and he didnt really respect that as we could see him begging the dark lord to not kill lily, only.

going to the recent times, he was good at teaching but was a terrible person, reflecting his misery on students. just becuase he was bullied in school doesnt mean he could be a bully aswell. theres some sort of redemption in that case. but him taking points away from gryffindor cuase he just didnt like their exsistance is unfair and it is a clear sign of favoritism. So really hes not redeemable there,

in his last days, he didnt deserve to die because there was no point for the dark lord to kill him. when he died, he did follow Dumbledore orders, but one did nearly kill harry-

for in summary, in some points he is redeemable, but it doesnt way the bad so no, he needs no redemption