It is extremely important to use words properly.  There are more than a few people who think the greenbelt is an issue and would like it abolished.  A self serving politician could easily use this issue to garner votes from uninformed voters who see people constantly making references that they don't understand.
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The greenbelt has a boundary that envelopes the entirety of the greenbelt.  To say something is inside it means it is within this boundary - not that it is outside the boundary but close to something else.
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We may agree it is an important area of land, but we don't seem to agree on the importance of ensuring that the message is clear to others