Do device bid adjustments work on Maximize conversions with a target CPA?

Google's "About bid adjustments" page (https://support.google.com/google-ads/answer/2732132) has a table of which adjustments each automated strategy supports. For Device, Target CPA gets a ✓ ("treated as a target adjustment"), while Maximize conversions is "-100% only".

Target CPA now lives inside Maximize conversions (you set a target CPA on a Max conversions campaign). Which row applies there? If I set mobile −20% on Max conversions + tCPA, does Google lower the mobile CPA target, or ignore everything except −100%?

Has anyone tested this, e.g. seen device CPA or spend move after an adjustment? The API also reports these campaigns as MAXIMIZE_CONVERSIONS rather than TARGET_CPA, which makes me suspect the "-100% only" row applies.