Steve.
If your message was "Germane to the conversation" then my correction of the 'facts' it contained must also have been.

As to your 'simplification of what the Guardian said:

You: Migrant workers do not take British workers' jobs.
The Guardian: "it is not a zero-sum game in which there are only a fixed number of jobs to go round: "It's true that, if an immigrant takes a job, then a British worker can't take that job – but it doesn't mean he or she won't find another one that may have been created, directly or indirectly, as a result of immigration". I doesn't say that he will find such a job, or try to state whether mass immigration creates more or less jobs than the number of immigrants.

You: Migrant workers do not "drive wages down."
The Guardian: "Several studies have shown a small negative effect of migration on the wages of low-skilled workers in certain sectors in certain parts of the country, particularly care workers, shop assistants, and restaurant and bar workers. The effect has been measured at less than 1% over a period of eight years." A small negative effect is, nonetheless an effect.

You: Migrant workers do not overload public services.
The Guardian: mentions this matter only in passing: "EU immigration has not harmed the pay, jobs or public services enjoyed by Britons."

You: Migrant workers actually create extra jobs by coming here.
The Guardian, does mention the creation of jobs because of immigration, but does not state whether this is a net gain in job numbers, or a net loss.