There's enough confusion to go around, and ultimately some judge is going to have to sort it.
The changes are to the Trespass act. The Wildlife act, Snowmobile Act and ATV specifically over-ride the trespass act in some defined situations and they were not amended. SERM went as far as explaining that on their website, before abruptly taking that down and taking the new position that that land not being posted doesn't imply consent. There's some weasel words in play there, since the Wildlife act doesn't imply anything it flat out says it. In the meantime SERM never met a fine it didn't like, and it is widely believed that they jerk each other off whenever a ticket is written.
In the meantime; don't believe the synopis, it isn't the act and they are known to sneak some deliberate "errors" into it.
The new rule, if it in fact the rule isn't being enforced because the natives are contesting it and SERM is scared spitless of which way a precedent setting case would go.