Hello :-)
Considering the outbound Passenger list in 1919 seemed to indicate the man going by his middle name..... I think the following is probably him .....and very possibly your man.
CENSUS 1921 Como Centre (Village), Hudson, Vaudreuil-Soulanges , Quebec
Terence Smith, 32, b ?Barbados? French race, Catholic
Jean Smith, 28, b USA
Marie Smith, 2, b Quebec
Boarder: H Seymour Robinson, male, single, 21, b England, parents English
No Occupation, C of E.
Year of Immigration to Canada: NY.
TRAVEL: 1932 SS Lady Rodney, Sailing from British West Indies
Arriving Montreal on 11 Jul 1932
Seymour Robinson 35
Born London, England
Prev in Canada from
1919 to 16 July 1932, in Montreal P.Q.
Wife: Doris, 70 Pine Avenue, St Lambert P.Q.
The above of 1932, was Hubert Seymour Robinson, b London, England
He died 29 Dec 1950, Montreal aged 52
Finda Grave
https://www.findagrave.com/memorial/109009235/hubert-seymour-robinson+
He was also described as : Alderman H Seymour Robinson in some Obits
(One of the Obits for this H S Robinson, has a photo of him)
His wife was Doris Louise Grose
She died 1959 (Obituary Date: 13 Jul 1959
Of 512 Crescent St. Montreal
https://www.findagrave.com/memorial/109009118/doris-louise-robinson+
I haven't got access to the full Obits.
https://www.newspapers.com/Cheers
AMBLY