Hi,
TC02050 relates to tax tax credits act and does not imply that personal allowances are available. Personal allowances are not related to tax credits.
Please have a look at the SA109 notes in relation to boxes 15 and 16. Citizens of an EEA country are still entitiled to personal allowances, as are individuals resident in some countries where it is included in the double taxation agreement.
Residence, remittance basis etc notes
If your wife does not meet the criteria for boxes 15 or 16, then she cannot claim personal allowances, while outside the UK.
Thank you.