Which basically means, that the line from OP that I quoted above is also incorrect/outdated, or I didn't get it right?
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You didn't get it right.
If I'm reading what Jane wrote correctly, being:
A profit making sale of any volume over a low threshold profit per visit per source (system) location of goods. 1000/cr per ton appears to be the threshold.
Then in a single visit to a station, you can only get as many "points" as you have source systems for your cargo, provided that cargo sells for over 1,000cr profit.
Here's a few examples... happy for Jane to come in and correct me though. Assume Gold and Palladium each sell for over 1,000cr/t profit each, and Bauxite sells for 950cr/t profit.
Example 1 - In System A, you buy 50t of Palladium. You sell all 50t in System B and earn "+1".
Example 2 - In System A, you buy 50t of Gold and 50t of Palladium. You sell 50t of gold and 50t of Palladium in System B, which is "+1" i.e the same as Example 1. This is because both Gold and Palladium are from the same system, and both goods are sourced from the same system.
Example 3 - In System A, you buy 250t of Bauxite. In system B, bauxite sells for only 950cr/t profit. You sell all 250t, but influence will not change (as it doesn't meet the 1000cr/t threshold)
Example 4. You buy 50t of Gold from System A, and 50t of Palladium In System B. You travel to System C and sell both Gold and Palladium, this earns +2, as the cargoes are from two different source systems.
Example 5. You buy 25t of Gold from System A. You go to System B and sell 25t. You leave the (system? Station?), come back, sell another 25t. In total, you get +2, as the transaction occurred over two visits.
If it functioned the way you supposed originally, this would mean the return of 1t trading, which would be a pretty bad thing.
EDIT: Goemon's guide was probably a bum-steer before, I was rushing on my phone.
Jane: Just curious for your opinion... does this mean the best approach for trading is to, say, buy Gold from one system, Palladium from another, Narcotics in another, Battle Weapons somewhere else... then just bounce from system to system (probably a Colony-economy, with the most demand) selling 1t of each at a time (nabbing +4 each visit)?
On an aside... I'm not quite convinced about the "per source system" bit... how does salvage/other non-purchased stuff work? Say, I picked up two Thargoid Sensors, one each in different Systems? Also seems somewhat contrived that Gold and Palladium bought from the same station would only be +1, but gold and palladium from different systems would be +2... and if so... why different system and not station?