That doesn't appear to address the issue of the .aligned attribute being missing?

I can emulate the problem on Biopython 1.73, and the online cookbook does indeed seem to suggest this functionality still exists, in section 6.5.2.7 Alignment object:

https://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc88

The aligner.align method returns PairwiseAlignment objects, each representing one alignment between the two sequences.

>>> from Bio import Align
>>> aligner = Align.PairwiseAligner()
>>> seq1 = "GAACT"
>>> seq2 = "GAT"
>>> alignments = aligner.align(seq1, seq2)
>>> alignment = alignments[0]
>>> alignment
<Bio.Align.PairwiseAlignment object at 0x10204d250>
Each alignment stores the alignment score:

>>> alignment.score
3.0
as well as pointers to the sequences that were aligned:

>>> alignment.target
'GAACT'
>>> alignment.query
'GAT'
Print the PairwiseAlignment object to show the alignment explicitly:

>>> print(alignment)
GAACT
||--|
GA--T
<BLANKLINE>
You can also represent the alignment as a string in PSL (Pattern Space Layout, as generated by BLAT [26]) format:

>>> format(alignment, 'psl')
'3\t0\t0\t0\t0\t0\t1\t2\t+\tquery\t3\t0\t3\ttarget\t5\t0\t5\t2\t2,1,\t0,2,\t0,4,\n'
Use the aligned property to find the start and end indices of subsequences in the target and query sequence that were aligned to each other. Generally, if the alignment between target (t) and query (q) consists of N chunks, you get two tuples of length N:

(((t_start1, t_end1), (t_start2, t_end2), ..., (t_startN, t_endN)),
 ((q_start1, q_end1), (q_start2, q_end2), ..., (q_startN, q_endN)))
In the current example, ‘alignment.aligned‘ returns two tuples of length 2:

>>> alignment.aligned
(((0, 2), (4, 5)), ((0, 2), (2, 3)))
while for the alternative alignment, two tuples of length 3 are returned:

>>> alignment = alignments[1]
>>> print(alignment)
GAACT
|-|-|
G-A-T
<BLANKLINE>
>>> alignment.aligned
(((0, 1), (2, 3), (4, 5)), ((0, 1), (1, 2), (2, 3)))