Her tips fall into roughly three types. 1) the bleeding obvious, such as you can mash potatoes with a fork 2) the utterly insane, see the mither* over the carabiner 3) receptacles can be used as receptacles (gu pots, jam jars, Easter egg boxes and so on).
*On Christmas Day my mum’s cat started yowling, my mum said “just ignore him, he’s mithering for his tea”. She pronounced it “mithering”.
As a possible fourth category, there are also those which she's simply stolen - often from foreign or outdated sources - without understanding them.
The advice about using a knife to open cans, for example, will have been less dangerous when used for old-style tinplate cans - they were sealed with lead solder, which was easy to slice through. But they were mostly replaced by steel cans sealed with rolled seams in the 1960s, and banned altogether in 1992. You might expect a 'literal canned food expert' to know this, but Jack clearly couldn't give a
duck.
Or mopping your floor with the water from a tumble dryer's condenser. The point of that is that it's (mostly) deionised - so if you use it in a steam mop, it'll stop it from getting gummed up with limescale. But Jack didn't clock that bit, so instead wrote about using it with a normal mop and bucket.
She was clearly desperate to hit her word count. Remember that the original mockups promised 200 grifty tips, only to be slimmed down later to 'over 120 delicious, money-saving recipes and home hacks'.