That's my suspicion too, if only persons seeking to enter premises are required to scan and checkers are just required to visually confirmed (c.f., actually scan the codes as restaurant checkers are required to in Hong Kong). Using a screenshot, everyone will be clean, unless and until some more serious checker require them to produce the code from scratch, starting with them logging into the Alipay (Leavehomesafe) app.

I've been wondering how the whole health code system has been enforced with gaping holes like that.