How to properly handle a conditional deprecation?

In my Missing In Actions plugin, I have to get code style settings to retrieve indent tab size from CodeStyleSettings. In the case that a PsiFile is null, the fallback is to use CodeStyleSettingsManager.getInstance().getSettings(project). This is flagged as deprecated usage, but the comment on the method states that it should only be used as a last resort when PsiFile is not available. Here is the code, with the comment copied from IC-2021.2.4 sources:

VirtualFile virtualFile = editor.getVirtualFile();
PsiFile psiFile = PsiManager.getInstance(project).findFile(virtualFile);
Language language = psiFile == null ? null : psiFile.getLanguage();
/* From the deprecation comment:
Use one of the following methods:

CodeStyle.getLanguageSettings(PsiFile, Language) to get common settings for a language.
CodeStyle.getCustomSettings(PsiFile, Class) to get custom settings.

If PsiFile is not applicable, use CodeStyle.getSettings(Project) but only in cases when using main project settings 
is logically the only choice in a given context. It shouldn't be used just because the existing code doesn't allow 
to easily retrieve a PsiFile. Otherwise, the code will not catch up with proper file code style settings since the 
settings may differ for different files depending on their scope.

vsch: in this case it is definitely the only choice, since the psiFile is not available when this call is made
*/
@SuppressWarnings("deprecation")
CommonCodeStyleSettings styleSettings = psiFile != null ? CodeStyle.getLanguageSettings(psiFile, language) : CodeStyleSettingsManager.getSettings(project);
IndentOptions indentOptions = styleSettings.getIndentOptions();