No they are not arguing that these people are intersex. They are claiming that chromosomal differences explain dyspraxia and dyslexia. Read the link you actually posted.
From the link you posted -
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Symptoms
Symptoms That Could Be Indicative Of An X & Y Chromosomal Variation
Infancy
Feeding Difficulties – trouble latching on or sucking from the bottle, or was a slow feeder
Texture Avoidance – coughs and/or gags when tasting new food textures
Delayed Ambulation – independent walking after 18 months of age
Congenital Muscular Torticollis – a tilting of the head towards the shoulder due to the shortening of the sternocleidomastoid muscle that is present from birth
Delayed Speech – rarely babbling between 6 and 12 months, or producing no sounds; a “quiet” baby
Preschool
Hypotonia – low muscle tone, particularly in the trunk
Speech and Language Delay – receiving services for speech delay
Sensitivity to Touch – tags in clothing, fusses at haircuts, dislikes getting hair shampooed
Motor Discoordination – difficulty in gross motor skills and fine motor tasks, contralateral movements
By age 3, child uses very few three-word combinations.
School Age
Behavioral Outbursts – seems to ‘explode’ for no reason several times per day
Shyness – more shy or timid than other children in social settings or at school
Clumsiness – falling for no reason, bumping into things often, avoiding sports
Social Language Differences – expressive communication is often delayed in comparison to auditory comprehension, and there could be an incidence of social anxiety
Fine Motor Skills – has difficulty with handwriting, using scissors, hands tire
Reading delays
Adolescence
Delayed Puberty – has not entered pubertal development at same age as peers
Pes Planus – flat-footedness, particularly if only member of family who has it
Tall for his age – height above the 95th centile
Language-based Learning Disorder – persistent difficulty with language-based learning, particularly reading and/or expressive vocabulary
Attentional issues – Attention Deficit Hyperactivity Disorder (ADHD), Attention Deficit Disorder (ADD)
Executive dysfunction and associated organization and planning deficits
Decreased muscle tone and strength
Please tell me how this research links to intersex people?
I accept that you have not borne a baby but YOU SAID that you have the type of body that will allow you to carry a child and that as your partner does not have that kind of body you will have that responsibility. You also said you were 'assigned female at birth'.
This means you are female with every fibre of your body. The word for adult human females is women.