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can anybody confirm that this is true and safe?
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Can't confirm it from personal experience, but if the gas sylinder is opened like that, then you won't have the pressure needed to work the action, and will have to do it manually. Gas would be vented out the front where the nut is missing, but should be safe, as far as personal injury, unless you get your hand out there (and how that might happen I can't imagine).
The M1 Garand is designed to fire MILITARY ammo. Only. That's a 150gr bullet @ 2740fps +/-. Or the heavier 172gr @2650+/-. And it is built to operate at the pressure curve used in the GI ammo. Again, ONLY.
Over the years commercial .30-06 ammo has been increased in pressure and velocity. Just take a look at the ballistics tables today. 150gr .30-06 is doing 2900fps! Think of it as running a car made for 87 octane gas on 100 octane. It will run (maybe run pretty good), but its running "hot". Things ARE going to go wrong, likely sooner than later, due to the extra strain on the engine. Same thing with the Garand.
All autoloaders are made to operate within a certain pressure level. get outside that, and things can be damaged. It may happen the first time, it may not happen for a long time, but the odds are that it will happen, if you keep at it long enough.