Change:
They should be able to press a key to toggle this on and off
Turn on a screen reader. Focus the terminal - you'll hear a hint about how to access the help menu. Open the accessibility help menu - for example, in the terminal, use . See message about how to disable the verbosity setting. Follow the instructions. Close the help menu, focus the terminal. you shouldn't hear that hint. Open the help menu. You shouldn't see that message.
I never hear the hint about how to access help. Unsure if that an issue with VoiceOver, a bug with this issue or another bug

Discussion:
private _getAriaLabel(): string { const verbose = this.configurationService.getValue<boolean>(AccessibilityVerbositySettingId.Chat); if (verbose) { <del> const kbLabel = this.keybindingService.lookupKeybinding('chat.action.accessibilityHelp')?.getLabel(); </del> <ins> const kbLabel = this.keybindingService.lookupKeybinding('editor.action.accessibilityHelp')?.getLabel(); </ins> return kbLabel ? localize('actions.chat.accessibiltyHelp', "Chat Input,  Type to ask questions or type / for topics, press enter to send out the request. Use {0} for Chat Accessibility Help.", kbLabel) : localize('chatInput.accessibilityHelpNoKb', "Chat Input,  Type code here and press Enter to run. Use the Chat Accessibility Help command for more information."); } return localize('chatInput', "Chat Input");

} let label = defaultAriaLabel; if (this._configurationService.getValue<boolean>(AccessibilityVerbositySettingId.InlineChat)) { <del> const kbLabel = this._keybindingService.lookupKeybinding('inlineChat.accessibilityHelp')?.getLabel(); </del> <ins> const kbLabel = this._keybindingService.lookupKeybinding('editor.action.accessibilityHelp')?.getLabel(); </ins> label = kbLabel ? localize('inlineChat.accessibilityHelp', "Inline Chat Input, Use {0} for Inline Chat Accessibility Help.", kbLabel) : localize('inlineChat.accessibilityHelpNoKb', "Inline Chat Input, Run the Inline Chat Accessibility Help command for more information."); } _inputEditorOptions.ariaLabel = label;

if (!screenReaderOptimized) { labelParts.push(nls.localize('terminalScreenReaderMode', "Run the command: Toggle Screen Reader Accessibility Mode for an optimized screen reader experience")); } <del> const accessibilityHelpKeybinding = this._keybindingService.lookupKeybinding(TerminalCommandId.ShowTerminalAccessibilityHelp)?.getLabel(); </del> <ins> const accessibilityHelpKeybinding = this._keybindingService.lookupKeybinding('editor.action.accessibilityHelp')?.getLabel(); </ins> if (this._configurationService.getValue(AccessibilityVerbositySettingId.Terminal) && accessibilityHelpKeybinding) { labelParts.push(nls.localize('terminalHelpAriaLabel', "Use {0} for terminal accessibility help", accessibilityHelpKeybinding)); }

MoveToTerminalPanel = 'workbench.action.terminal.moveToTerminalPanel', SetDimensions = 'workbench.action.terminal.setDimensions', ClearPreviousSessionHistory = 'workbench.action.terminal.clearPreviousSessionHistory', <del> ShowTerminalAccessibilityHelp = 'workbench.action.terminal.showAccessibilityHelp', </del> SelectPrevSuggestion = 'workbench.action.terminal.selectPrevSuggestion', SelectPrevPageSuggestion = 'workbench.action.terminal.selectPrevPageSuggestion', SelectNextSuggestion = 'workbench.action.terminal.selectNextSuggestion',

TerminalCommandId.SelectNextPageSuggestion, TerminalCommandId.AcceptSelectedSuggestion, TerminalCommandId.HideSuggestWidget, <del> TerminalCommandId.ShowTerminalAccessibilityHelp, </del> TerminalCommandId.FocusHover, <ins> 'editor.action.accessibilityHelp', </ins> 'editor.action.toggleTabFocusMode', 'notifications.hideList', 'notifications.hideToasts',