Looking at the statistics that sounds about right.
Though, relatively nearby Hartlepool Utd survived 11 reelections from the fourth tier and 3 more when there were just three tiers, with regional divides. Crewe, benefited by its geographical position, survived 7, as did Walsall from Div 3 North. Halifax, Rochdale and York all survived 6 times from the fourth tier. Barrow survived 5 before dropping out on the 6th.