AttributeError: module 'scater' has no attribute 'normalize'
I was able to get to the normalized values using logcounts function in the following way:

mtx_norm_r = sceLib.logcounts(sce)
mtx_norm = np.array(mtx_norm_r)


Since I used log_exprs_offset=1 the field that I needed to use is logcounts, otherwise it should be normcounts which I found here.