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Rule no-unsafe-function-type has a fixable : 'code' property in its meta :

  meta: {
    type: 'problem',
    docs: {
      description: 'Disallow using the unsafe built-in Function type',
      recommended: 'recommended',
    },
-    fixable: 'code',
    messages: {
      bannedFunctionType: [
        'The `Function` type accepts any function-like value.',
        'Prefer explicitly defining any function parameters and return type.',
      ].join('\n'),
    },
    schema: [],
  }

while no 'fix' or 'suggestion' are present in rule file. This is probably related to the fact that this rule is one of the 3 new rules based on the extinct ban-types from this commit :

ban-types ( fixable ) -> no-restricted-types ( fixable )
                      -> no-unsafe-function-type ( not fixable )
                      -> no-wrapper-object-types ( fixable )