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The leaked IPCC documents indicated that Menezes was seated on the train carriage when the SO19 armed unit arrived. A shout of "police" may have been made, but the suspect had no opportunity to respond before he was shot. The leaked documents indicated that he was restrained by an undercover officer before being shot.
During the 2008 inquest into Menezes's death, passengers who were travelling in the same carriage also contradicted police accounts, saying that they heard no warnings and that Menezes gave no significant reaction to arrival of the policemen. One passenger said that Menezes appeared calm even as a gun was held to his head, and was clear that the police officers did not shout any warnings before shooting him.
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This is how the Met change how incidents are remembered by the public. As @rhb posting shows, Menezes was never approached by the police, nor did he run away from them, all those lies were briefed to the media in the aftermath to justify their actions.
But you can be executed for travelling on the tube so nothing would surprise me.