It's a problem of Angular update guide application, the recommendations are just summary of matches from the start version to end version, there's no smart filter to ignore some of them.

The specific rule is not actually for v6.

docsarea=updating

Confirmed that the default was changed to false for v6: #22046

https://github.com/angular/angular/blob/master/packages/compiler/src/config.ts
export function preserveWhitespacesDefault(
preserveWhitespacesOption: boolean | null, defaultSetting = false): boolean {
return preserveWhitespacesOption === null ? defaultSetting : preserveWhitespacesOption;
}

Confirmed AOT compiler options doc is correct:
https://angular.io/guide/aot-compiler#preservewhitespaces

Sounds like update.angular.io could be more clear. Thanks.

Clarified in angular/angular-update-guide@8e6eda5

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