It was his address before he entered the workhouse, the workhouse was at Brownlow Hill.
It doesn't give a reason for admission, he could have been ill, and admitted to the hospital.
Axel Gustaf Mattson the son was born 24 September 1898 address on the baptism record is 62 Upper Pitt Street. (bap. 12 October 1898) father Mariner
St Michael, Liverpool
Katie Amanda Mattson was born 10 January 1900 address 62 Upper Pitt Street (bap 31 January 1900) at St Michael, Liverpool.
father Striker.
1901 the Mattson family are at 41 Upper Pitt Street.
1911 the Petersen family are at 31 Kent Street.
1921 the Matson family are at 4 Bartholomew Street.
Ref: ancestry.
Notes:
Lancs OPC has address 62 Upper Frederick Street for Axel baptism but if you look at the original entry on ancestry it's Upper Pitt Street.