With the current free mobile app being bombarded with ads and locking features like mowers behind a paywall, it's not a great port for speedruns at all. It's preferable to use an APK of the older Android release instead, which was unlisted from Google Play in 2017 and has none of the annoyances.

Android v6.1.11 can be easily downloaded here: https://www.speedrun.com/pvzm/resources/7mm4m

Runs done on the current app are still allowed but heavily disincentivized.